Human sperm and egg cells have ____ chromosomes.
A. 42
B. 21
C. 23
Answer:
They each have 23 chromosomes
Explanation:
Answer:
C. 23
Explanation:
Human sperm and egg cells have 23 chromosomes.
2. Define biomagnfication.
Answer:
It is the gradual accumulation of substances
List Name two material resources and give an
example of how each is used.
Answer:
Wood : used for building tables and chairs, and sometimes houses
Plastic: used in a way wheir we put drinking water in it, or grocceries.
Explanation:
Hope this helps!!!
Answer:
sand and cotton. Sand is a raw material that is used in making a clear window glass. such as socks and shirts, are made from cotton.
hope it helps
In the diagram below, you will see three materials. Each has its index of refraction given.
Air n = 1
Water: n 1.33
Glass: n =1.5
A. On the diagram above, trace the path of a light ray through these materials.
From air into water
From water into glass
What does DNA prove about organism ancestry?
A. Plants and animals are not related to one another
B. That all organisms are related to one another
C. DNA and RNA are completely different forms of genetic coding
D. Extraterrestrial life will have DNA as well
Answer:
B. That all organisms are related to one another
Answer:
B. That all organisms are related to one another
Explanation:
Fossils, anatomy, embryos, and DNA sequences provide corroborative lines of evidence about common ancestry, with more closely related organisms having more characteristics in common. DNA underlies the similarities and differences in fossils, anatomy, and embryos.
Which is the site of the most ATP production during cellular respiration?
nucleus
mitochondrion
cytoplasm
chloroplast
Answer:
mitochondrion
Explanation:
the mitochondrion
someone please help me
Amino acids build
A. proteins
B. monomers
C. nucleic acids
Answer:
A. proteins
Explanation:
Amino acids builds up the proteins.
Which of the following statements is MOST accurate: Group of answer choices Animals evolved during the Cambrian Explosion because the Earth was organized into a supercontinent called Pangea Animals evolved during the Cambrian Explosion because oxygen on Earth had become abundant Animals evolved during the Cambrian Explosion because the Earth had just recovered from an asteroid impact Animals evolved during the Cambrian Explosion because carbon dioxide on Earth had become abundant
Answer:
Animals evolved during the Cambrian Explosion because oxygen on Earth had become abundant.
Explanation:
Photosynthesis could be responsible for the rise in the amount of oxygen in the seas and atmosphere near the beginning of the Cambrian. This rise of oxygen concentration allowing the evolution of larger animals having complex respiratory and circulatory systems. So we can conclude that evolution in the physical and genetical characteristics of animals occur during the Cambrian Explosion.
What are the chances that the parents will have a hairless baby guinea pig?
A. 75%
B. 25%
Answer:
I believe it is B
Explanation:
hope this helps
Answer:
B. 25%
Explanation:
There is a 50-75% or about half chance that the babies bred by a Skinny Pig and a haired Skinny pig gene carrier, will have hairless Skinny pig babies. The rest of the babies will just be skinny pig gene carriers. There is only a 25% chance that 1 or so hairless skinny babies will be born in these litters.
On a cold day, the temperature of the air reaching alveoli is raised in the nasal passages because the
What are the characteristic of a cell?
Answer:
All cells have a cell membrane, cytoplasm, and DNA. cells differ in how their genetic information is contained. All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
hope this helps
have a good day :)
Explanation:
Which structures do plant cells have for making food that animal cells do not?
Answer:
chlorophyll is the answer
A Russian citizen has illegally obtained a Siberian tiger and is trying to sell the tiger’s fur in the United States. What treaty does this violate?
A.Tiger Treaty
B.Lacey Treaty
C.CITES
D.EPA
Answer:
Cites,
Explanation:
Another Answer on Brainly
The treaty that the Russian citizen violated is CITES or Convention on International Trade in Endangered Species. The treaty was drafted from 1973 in order to protect the over - exploitation of wildlives.
A Russian citizen has illegally obtained a Siberian tiger and is trying to sell the tiger’s fur in the United States, CITES treaty does this violate. Therefore, the correct statement is option C.
What is CITES?CITES, or the Convention on International Trade in Endangered Species of Wild Fauna and Flora, is the treaty that this action would break. Since Siberian tigers are considered an endangered species, the Convention on International Trade in Endangered Species (CITES) regulates international trade in their parts or products.
A violation of CITES regulations is the illegal possession, sale, or transportation of an endangered species or its parts or products, like fur, without the necessary permits or documentation.
The Lacey Act is a US regulation that denies the exchange unlawfully got natural life, plants, and their items, yet refers to a worldwide settlement that oversees the exchange of jeopardized species across borders. The United States Environmental Protection Agency (EPA) is in charge of enforcing environmental laws.
Therefore, the treaty that this action would violate is CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora).
Learn more about the CITES here:
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Why do identical twins separated at birth show DIFFERENCES as seen in the pictures?
A. Their DNA changed because of the different environments they lived in.
B. Different genes were turned on or off because of he different environments they lived in.
Answer:
B. Different genes were turned on or off because of the different environments they lived in.
Explanation:
Your DNA does not change but it can turn on some parts and off others depending on your enviroment.
Answer:
B. Different genes were turned on or off because of he different environments they lived in.
Explanation:
The identical twins separated at birth show different genes were turned on or off because of he different environments they lived in.
Only forager bees leave the nest for their jobs
A
True
B
False
The most important feature that permits a gene to act as a molecular clock is The most important feature that permits a gene to act as a molecular clock is having a reliable average rate of mutation. having a larger proportion of exonic DNA than of intronic DNA. its being acted upon by natural selection. having a large number of base pairs. its recent origin by a gene duplication event
Answer:
The answer is "The first choice".
Explanation:
The hypothesis of such a molecular clock says because DNA and protein sequences develop at a pace generally constant over time as well as between different organisms. The whole idea is thus incredibly beneficial and for estimation of the historical periods, if the molecular biological hypothesis is valid, then the most significant feature enabling DNA to act as a molecular clock it has a reliable mean mutation.
NO LINKS PLEASE
If Charles Darwin could return to the Galapagos Island today, which of the following is an example of a change he might see?
O A. no changes
O B. more islands
O C. more tortoises
OD. new species of iguanas
Answer:
D. New species of iguanas
Explanation:
A- doesn't make sense because nature changes every day.
B- More islands is possible but not likely considering your other options.
C- More tortoises is also possible but because I haven't read your text book or where your learned this information I can't be sure this is it.
D- Is the likeliest
Is photosynthesis the ONLY driver for cycling matter and energy in ecosystems? yes or no
Do not play on my question please.
which feature of stem cells enable them to replace cells in tissues such as skin?
The feature of stem cell which enable them to replace cell in tissues are that they can divide indefinitely to generate new cells and they can convert into the different types of cells that make up the body as they divide.
What is a stem cell ?A stem cell is a cell that has the unique capacity to grow into different types of cells in the body.
They may be utilised in the future to replace cells and tissues that have been damaged or destroyed owing to illness.
Stem cells are classified into three types which are Embryonic stem cells, Adult stem cells, Induced pluripotent stem cells.
Embryonic stem cells provide new cells to an embryo as it grows and develops into a newborn.
Adult stem cells generate new cells as an organism matures and replace damaged ones.
Induced stem cells are stem cells created in the laboratory by scientists.
Learn more about Stem Cell here:
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Please help the picture is above I’ll mark as brainliest.
Select the correct layers.
Which two layers are approximately the same age?
core sample 1
core sample 2
Answer:
Core sample 1: Lowest Layer
Core sample 2: Highest Layer
Explanation:
Both layers have the same fossils and textures of soil/rock, so we can assume overturning happened. Also, I got it right on the test!! :)
Please mark brainliest ^^
Answer:
lowest layer of sample one and highest layer of sample 2.
Explanation:
State two similarities and two differences between an
amoeba and a plant cell:
Answer:
S: Both are eukaryotic (1) and contain a cytoplasm + vacuole (2).
D: Amoebas lack a cell wall (1) and are not photosynthetic organisms (2).
Explanation:
A multicellular organism. Define multicellularity and explain how you know this organism is multicellular.
Answer:
A multicelular organism
Explanation:
You can tell an organism is multicellular because it contains more than one cell. It has many cells that help build the organism.
To test for protein, you added Biuret solution and observed color changes. Suppose that the color data below was observed.
A 3-column table has 1 rows. The first column is labeled Gelatin (+ control) with entry pink/purple. The second column is labeled
Water (negative control) with entry pink/purple. The third column is labeled Mystery food sample with entry blue.
The data above indicate an error. How do you know? What might have caused the error?
Answer:
When tested for proteins neither gelatin or water was not pink/purple
Explanation:
credit to person who commented on question above
Answer:
The water should not be pink/purple because water should test negative for protein. The water should actually have turned blue, because Biuret solution is blue. Someone may have mislabeled the test tube with water. The water may have been contaminated with a protein.
Which of the substances below are PRODUCTS of the overall chemical reaction of
photosynthesis?
A. ammonia
B. Unitrogen
C. carbon dioxide
D. water
oxygen
sugars
Answer:
essentially glucose and oxygen are the products of photosynthesis
Explanation:
what do you mean by photo synthesis
Answer:
photosynthesis is the process in which plants take sunlight water and soil then convert it to sugars that it uses for food
Adrenergic receptors Select one: a. can be activated by the release of epinephrine. b. have two structural forms - muscarinic and nicotinic. c. when activated stimulate skeletal muscles to contract. d. can be found in both the sympathetic and parasympathetic divisions. e. are activated by the release of acetylcholine.
Answer:
The correct answer is a. can be activated by the release of epinephrine.
Explanation:
Epinephrine is a hormone and neurotransmitter naturally secreted by the body through the adrenal glands, synthesized and stored in the adrenal medulla and released into the systemic circulation. Epinephrine is a non-selective adrenergic agonist, stimulating alpha1-, alpha2, beta1, and beta2-adrenergic receptors. The systemic actions of catecholamines are mediated by the binding of these compounds to plasma membrane receptors, of the GPCR type widely distributed throughout the body and known as adrenergic receptors, which are activated by the catecholamines adrenaline (epinephrine) and noradrenaline . These receptors cause different effects depending on the G protein subtypes to which they are associated and the signal transduction mechanism linked to the specific G protein.
What organelle reforms around the chromatids at opposite ends of the cell?
A. Chloroplast
B. Vacuole
C. Centriole
D. Nucleus
write any three write any three basis of evolution of living beings on the earth
Answer:
Hadean, archean, proterozoic
