3. Which of the following events involves a chemical change?
A. A cake rises in the oven.
B. Salt is dissolved in warm water,
C. A pencil is broken into two pieces.
D. Sandy water is filtered to extract the sand from the water.

Answers

Answer 1

Answer:

i think A sorry if its wrong but if you have 2 chances its B

Explanation:


Related Questions

Which of the following is not
one of the kingdoms of living
things?
a Fungi
b. Bacteria
c. Animalia
d. Protista

Answers

Answer:

B. Bacteria

Explanation:

Because bacteria are unicellular organisms belonging to the prokaryotic group where the organisms lack a few organelles and a true nucleus

Bacteria is not one of the kingdoms of living things. So, the correct option is (B).

What are the Different kingdoms of Living things?

Living things are divided into 5 kingdoms. These are:

1. Monera

It is the kingdom of microscopic living things that groups together prokaryotes (archaea and bacteria) present in all habitats and composed of single-celled things without a defined nucleus. Bacteria belongs to this kingdom.

2. Protista

This group is primitive of eukaryotic which is paraphyletic which includes common ancestor but not all its descendants. Protozoa belongs to this kingdom.

3. Fungi

This kingdom includes yeasts, molds and all species of mushrooms and toadstools, which are multicellular aerobic heterotrophic eukaryotes, have chitin in their cell walls, feed on other living things, and reproduce by means of spores.

4. Plantae

Trees, plants belong to the kingdom Plantae, which is characterized by its sedentary, multicellular and eukaryotic nature. They are autotrophs, whose cells contain cellulose and chlorophyll which are essential for life on Earth as they release oxygen through photosynthesis.

5. Animalia

The kingdom Animalia is divided into two major groups – vertebrates and invertebrates which are multi-celled, heterotrophic eukaryotes that have aerobic respiration, sexual reproduction and the ability to move. This kingdom includes mammals, fish, birds, reptiles, amphibians, insects, molluscs and annelids.

Thus, Bacteria is not one of the kingdoms of living things. So, the correct option is (B).

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Give two ways the sperm cell is adapted for fertilisation

Answers

Answer: (1) It has a tail to travel to the egg (2) contains a nucleus in the head which will fertilise the egg

Explanation: Firstly it has a tail to help it travel to the egg. Secondly it contains the nucleus in the head that will fertilise the egg. Thirdly the acrosome contains enzymes in order for the sperm to penetrate the egg. Finally, the sperm cell is packed with mitochondria to provide the energy needed to reach the egg.

Sperm cells are highly specialized for the purpose of fertilization. Here are two ways in which sperm cells are adapted for this process: Streamlined shape, Acrosome, and enzymes.

1. Streamlined shape: Sperm cells have a streamlined shape, often described as being tadpole-like, with a long and slender tail (flagellum) and a compact head region.

This shape is adapted for efficient swimming through the female reproductive tract to reach the egg. The flagellum allows the sperm to propel itself with whip-like movements, providing mobility and the ability to navigate through the female reproductive system.

The streamlined shape reduces drag and enables the sperm to move swiftly towards the egg, increasing the chances of successful fertilization.

2. Acrosome and enzymes: The head region of a sperm cell contains a specialized structure called the acrosome. The acrosome is a cap-like structure that covers the front portion of the sperm's head.

Inside the acrosome, there are enzymes, such as hyaluronidase and acrosin, which play a crucial role in fertilization.

When the sperm reaches the vicinity of the egg, the enzymes are released and help the sperm penetrate through the protective layers surrounding the egg, such as the zona pellucida.

Thus, the streamlined shape and the presence of the acrosome with enzymes are two important adaptations of sperm cells that increase their chances of successful fertilization by facilitating efficient swimming and penetration of the egg's protective layers.

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plssss help meee now asap giving brainless​

Answers

1. Gravity also increases

2. Gravitational attraction also decreases

3. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.

4. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.

Whenever the translation molecule reads the codon UGA, what occurs

Answers

Answer: It begins when a stop codon (UAG, UAA, or UGA) enters the ribosome, triggering a series of events that separate the chain from its tRNA and allow it to drift out of the ribosome.

Explanation:

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Question 1 of 12
Renal System - Practice - 7207
-
Release of ADH from the posterior pituitary gland is stimulated by
O increased blood volume
o increased osmotic pressure of plasma
O low osmotic pressure of interstitial fluid
O alcohol consumption
O All of the choices are correct

Answers

Answer:

o increased osmotic pressure of plasma

GIVING BRAINLY!! The relationship between the mass of an object and its weight on Earth is constant.
A True
B) False

Answers

Answer:

The mass of an object is never zero. You measure mass with an ordinary balance on Earth or an inertial balance in space. Weight depends on the effect of gravity, so it can change depending on where it's measured. In the absence of gravity, weight can be zero.

Explanation:

hope this helps

spermatogenesis results in (a) two haploid cells (b) three haploid bodies (c) one haploid sperm cell and three polar bodies (d) four haploid sperm cells​

Answers

D - The meiosis process results in the split of the cell into 4

Which statement about cellular respiration is true?
It produces oxygen.
It requires water.
It is used by every living cell.
it converts energy to food.​

Answers

Third one. Pls mark me brainliest

All organic compounds contain the element a. Carbon b. Hydrogen c. Nitrogen

Answers

Answer:

yes

Explanation:

becawse organic cpd are a compound that formed from living things

Karl Marx promoted Which economic idea?
A. Market economies will break down because workers will demand more power.

B. Businesses should spend their own funds instead of borrowing from banks.

C. Trade between countries is dangerous and should be limited whenever possible.

D.Governments have no legal right to force any person or business to pay taxes

Answers

Answer: C.

Explanation:

What chemical in the chloroplast captures sunlight for photosynthesis to take place?

Answers

Answer:

pigment chlorophyll

Explanation:

Mark me the brainliest please

based on what factor do we choose the method of separation for different components of a mixture?​

Answers

Answer:

Different components of a mixture have different properties on the basis of which we device the method that is used to separate it from other components of the mixture

-TheUnknownScientist 72

How are the different fields of biology related to each other

Answers

Answer:

Modern principles of other fields— chemistry, medicine, and physics, for example—are integrated with those of biology in areas such as biochemistry, biomedicine, and biophysics. Biology is subdivided into separate branches for convenience of study, though all the subdivisions are interrelated by basic principles.

Explanation:

Answer:

Hey mate.....

Explanation:

This is ur answer.....

There are three major branches of biology – botany, zoology and microbiology. Botany is the branch of biology which deals with the study of different aspects of plants. Theophrastus is known as the father of Botany. Zoology is the branch of biology connected with the study of different aspects of animals.

Hope it helps!

Brainliest pls!

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what do you call to those animals that eat both plants and animals ?​

Answers

Answer:

omnivores eat both meat and plants

carnivores eat meat

herbivores eat plants


from the roots up through the stems and into the leaves, replacing
the water used in ———— ??

Answers

Answer:

Transpiration

Explanation:

Plants lose water by transpiration.

Where does hunger originate? A., B., C., or D.

Answers

Answer:

The answer is (C) In the hypothalamus

Explanation:

Within the hypothalamus are nerve cells that, when activated, produce the sensation of hunger.

Do you have 5th grade
science for kids in Texas

Answers

Answer:

Yes, indeed they do.

Explanation:

I called my cousin in texas just to make sure this answer is correct. No problem.

3 parts of a nucleotide are

Answers

Answer:

Nucleobase, Five-carbon sugar, phosphate group.

Base, sugar and group.

Explanation:

Nucleotides are composed of three subunit molecules: a nucleobase, a five-carbon sugar (ribose or deoxyribose), and a phosphate group consisting of one to three phosphates.

if you like my answer, please mark me brainliest !! thanks <3 !!

The primary factors which determine each biome are:


land features
plate tectonics
sunshine
rainfall
temperature

Answers

Answer:

temperature is the most important factor of any biome

When you need to convert from one system of measurement to another, you should convert to the a) system that will have the highest number. b) system that will have the smallest number. c) system used on the medication label. d) metric system.

Answers

Answer:nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

Explanation:

mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmjnn    bnnnnnnnn

What is the true nature of science?

Answers

Answer:

Scientific Knowledge Is Based on Empirical Evidence; Scientific Knowledge Is Open to Revision in Light of New Evidence; Science Models, Laws, Mechanisms, and Theories Explain Natural Phenomena. Science Is a Human Endeavor; and. Science Addresses Questions About the Natural and Material World.

The true nature of science is to build knowledge about the natural world. With that information we come up with new ideas and discover new evidence every day

Identify the criteria used to accept foods purchased for the following categories

Meat
Fish
Shellfish
Poultry

Answers

Poultry I believe it is :)

Select the correct answer.
Which one of the following is NOT a macromolecule?
O protein
nucleic acid
carbohydrate
water

Answers

water. the only 4 macromolecules are nucleic acid, carbohydrate, lipids, and protein
Water :)

11:11
Macromolecules ~ a Molecule containing a very large number of atoms, such as protein, nucleus acid, or synthetic polymers

If a DNA molecule with a total of 2500 nucleotides has 1500 purines, how many guanines are in this DNA molecule?

Answers

Answer:

I'm pretty sure there would be 1000 guanines in the DNA molecule.

Explanation:

Hope this helps. . . <3

If a DNA molecule with a total of 2500 nucleotides has 1500 purines, total number of guanines are in this DNA molecule is 1000 guanines in the DNA molecule.

What will be the total number of thymines if a DNA molecule has a total of 1500nucleotides?

The DNA molecules would be given and it have 450 thymines if the DNA molecule has the total of 1500 nucleotides and the DNA molecule also have been known as the deoxyribonucleic acid has been made up of the double helix. The DNA molecule with the total of 1500 nucleotides would contain 750 cytosine and Thymines and 750 guanines and adenine.

Hence, we can have the expression:

C + T = 750

If there are 300 cytosines, hence;

300 + T = 750

T = 750 - 300

T = 450

A nucleotide has the monomer constituting DNA or RNA biopolymer molecules and the double-stranded DNA molecule posseses two strands of DNA made up of the nucleotides.

Therefore, If a DNA molecule with a total of 2500 nucleotides has 1500 purines, total number of guanines are in this DNA molecule is 1000 guanines in the DNA molecule.

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When exercising routinely, timing the food that you eat around your exercise activities is important and has a significant impact on your energy levels. Carbohydrate intake, in particular, can affect performance, with simple carbohydrates and complex carbohydrates having different ideal times for consumption. The best types of carbohydrates to eat during and/or immediately after exercise are simple carbohydrates, whereas complex carbohydrates are ideally consumed a couple of hours before exercise. Complex carbohydrates take longer to digest and enter the bloodstream and can help build glycogen stores. Sort the following food items

a. Foods rich in simple carbohydrates.
b. Foods rich in complex carbohydrates.
c. Foods without carbohydrates

Answers

Answer:

(a.) Foods rich in simple carbs- Low fat smoothie and sport drinks with glucose

(b.) Foods rich in complex carbs- whole-wheat pancakes, whole-wheat spaggetti with marinara sauce and brown rice with vegetables

(c.) Food without carbs- grilled salmon and roasted chicken breast

Explanation:

Simple carbs are easy to digest and eaten before a workout, hence the sports drink and low-fat smoothie falls under that category, while complex carbohydrates are hard to digest...think anything with wheat.

Will mark Brainliest
In general, freshwater fish require salinity (salt) levels of 1.0 ppt or lower. You measure the salinity of a freshwater aquarium to be 3.0 ppt. Predict what will happen to the cells of the fish as a result of the salinity level in the aquarium.

1) Is tank water hyper, hypo or isotonic to the fish cells? Explain why.

2) Based on your answer to part 1, what will this type of solution ultimately do to the cells of the fish? ( which way will the water move into or out of the fish cells?)

Answers

The cells of the fish will lose water to the aquarium water by osmosis, shrink up, and probably die with time.

1) The tank water is hypertonic to the cells of the fish. Hypertonic solutions are those with higher solute concentrations compared to the sap of the cells placed in them. Hypotonic solutions have lower while isotonic solutions have the same concentrations as the sap of cells placed in them.

2) Because the tank water is hypertonic, the cells of the fish will lose water to the water in the aquarium. When this happens, the cells shrink, and may eventually start dying if the situation remains unchanged enough.

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Which organelle in a plant cell is most affected when a plant has not received any water? Explain your reasoning.

Answers

Explanation:

that's why hope it helps you

Which property is shared by the cells of all living things?

A. The cells contain DNA composed of adenine, thymine, guanine, and cytosine.

B. The cells have chromosomes that are located inside a membrane-bound- nucleus.

C. The cells are surrounded by a phospholipid bilayer and a cell wall made of
cellulose.

D. The cells rely on mitochondria to carry out aerobic cellular respiration.

Answers

Answer:

A

Explanation:

B) not all cells have a nucleus. For example, prokaryotes have no nucleus

C)Not all cells have a cell wall.(Animal cells don't)

D) not all cells have mitochondria (Prokaryotes don't)

A) all cells contain DNA, and DNA is all composed of adenine, thymine, guanine, and cytosine.

Living things are those organisms that have life and they possess the basic characteristics that enable them to be termed as living. This include growth, reproduction, irritability etc.

The property listed in the options shared by cells of all living things is the cell contain DNA composed of adenine, thymine, guanine and cytosine.

All living things contain the genetic material (DNA) that carry the needed information essential for their cells to function. Although some living things do not have a membrane bound nucleus eg prokaryotic cells. Many differences therefore exists that differentiates the living things from one another bringing them into groups.

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Can someone help me, my paper is due tonight.

Describe solution concentration outside the cell in terms of hypotonic, hypertonic and isotonic.

Answers

Answer:

see below

Explanation:

Hypotonic solution is a very dilute solution to the more concentrated solution. Hypo means under . A solution with a lower concentration of solutes than the cytoplasm of a cell, that solution is hypotonic to the cytoplasm. The cell expands as water moves in.

Hypertonic solution is a more concentrated solution to cytoplasm. Hyper means above. A hypertonic solution has higher concentration of solutes than the cytoplasm of the cell. The cell shrinks as its cytoplasm loses water.

Isotonic solution is when two solutions of equal concentration are separated by a semi permeable. Iso means equal. Therefore, in isotonic solutions, water movement out of a cell balances the water movement into it. Cells in the body are usually surrounded by a fluid. The cytoplasm in the cell is usually isotonic to the fluid outside the cell. Hence, no net gain or loss of water by cells.

So, basically, if a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink. In an isotonic environment, there is no net water movement, so there is no change in the size of the cell. When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell.

The factor in the environment that does NOT depend on the number of members per unit area?

1) Predation
2) Competition
3) Pollution

PLEASE PLEASE

Answers

I’m pretty sure that it’s 3) Pollution
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