Which of the following statements helps support the endosymbiotic theory?
Choose 1 answer:
A
All cells contain ribosomes that conduct protein synthesis.
B
Cells contain genetic information in the form of DNA.
If isolated from a eukaryotic cell, mitochondria can no longer survive and reproduce on their
own.
If isolated from a plant cell, a chloroplast can survive and reproduce on its own.

Answer:

Life expectancy has steadily risen.

People live longer lives.

To understand the reasons why the number of people in the world has increased and the population growth rate has decreased, it is necessary to understand how the world's demographic growth rate is calculated.

The calculation is made from the balance between the total number of people alive and the total number of deaths that occurred in a period of time.

Therefore, we can understand that the population growth rate has decreased due to several relevant factors, such as:

These are some of the reasons that help us understand why population numbers increase and population growth rate decreases.

Economic development, new technologies and a better quality of life for the population are directly related to the decrease in the population growth rate.

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Answer: true

Explanation:

it does contain carbon

Organic molecules contain carbon and inorganic molecules do not contain carbon. Organic molecules are synthesized by living things and inorganic molecules are not. Organic molecules are consumed by living things and inorganic molecules are not. All organic molecules contain carbon, bonded to other elements.

So true.

Answer:

Bowling ball

Explanation:

Answer:

1To purify the air so we can breathe properly

2Sequester carbon for climate regulation

Answer:

D)  Sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.

Explanation:

Answer:

none

Explanation:

Because the four options are: XX XX Xx Xx. There will be a 50% chance of a carrier but no actual hemophilia.

The probability that the son will have hemophilia if the parents are a normal man and a woman who is a carrier is 50%. The correct option is C.

A deficiency in the blood clotting factor VIII results in hemophilia A, an inherited bleeding disorder. Lack of factor VIII prevents the blood from clotting effectively to stop bleeding.

Due to a rare disorder called hemophilia, the blood does not clot normally because it lacks enough blood-clotting proteins. If you have hemophilia, you may bleed more profusely and for a longer period of time than you would if your blood clots normally.

A pedigree can be used to trace the X-linked recessive disorder (Xh) hemophilia through the generations. This (D) had hemophilia and passed away as a result of complications. Hemophilia is a bleeding disorder that causes abnormal blood clotting, which lengthens the time it takes for an injury to bleed.

Therefore, the correct option is C, 50%.

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The question is incomplete. Your most probably complete question is given below:

- 0%

- 25%

- 100%

- 50%

- 75%

Answer:

the sample contains mostly heterochromatin  

Explanation:

Heterochromatin refers to a highly condensed state of DNA, whereas euchromatin is lightly packed. It is for that reason that heterochromatin is associated with a transcriptionally inactive state, whereas euchromatin regions are active for transcription. Heterochromatin regions resist DNases because these enzymes don't cut DNA randomly, but they show sequence preference. In consequence, highly repetitive DNA heterochromatin regions (e.g., centromeres, telomeres, etc) may exhibit resistance to DNA cleavage.

Pollution specifically air pollution can cause acid. Gases such as sulphur (IV) oxide and Nitrogen (IV) oxide when they are released into the atmosphere and comes into contact with precipitation, that is rain water causes acid rain. Sulphurous acid and Nitric acid is formed thus the rain falls in acidic form.

Acid rain when it falls on the leaves of the flora (plants) causes removal of the green colouring matter (chlorophyll) thus making plants to be deficient of food. Food in plants is made my the process of photosynthesis, removal of chlorophyll in plants kills them due to lack of food.

Also when acid rain finds it's way into the water bodies through surface runoff, aquatic animals such as fishes die due to lack of favourable environment and oxygen deficiency in water. Acidity in the soil also kills important decomposers therefore soil aeration is altered.

Flowers that bloom in different months is an example of temporal isolaton.

Temporal isolation is a type of reproductive isolation that occurs when two or more species reproduce at different times, thereby preventing mating between them. This can happen in a variety of ways, such as when one species is active during the day and the other at night, or when they breed during different seasons.

Temporal isolation can lead to the evolution of new species because it prevents interbreeding between populations that would otherwise exchange genetic material. Over time, these isolated populations can accumulate genetic differences that make it increasingly difficult for them to interbreed, leading to the formation of distinct species that are reproductively isolated from one another.

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Answer:

Ecosystems are influenced by both biotic and abiotic factors. Biotic factors include animals, plants, fungi, bacteria, and protists. Some examples of abiotic factors are water, soil, air, sunlight, temperature, and minerals.

Explanation:

Muscular Strength

Muscular endurance

Flexibility

Body Composition

Answer:

Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.

Explanation:

Answer:

A. 100%.

Explanation:

Since both spiders have either AA or aa, every possible combination would result in an Aa genotype. And, because A is dominant to a, they will all display the A trait—be patterned instead of plain.

So it is 100%.

Answer:

It's A

Explanation:

Had it on a test

Humans are considered animals because as in animals zygotes after cell division turns into a blastula, hence option a is correct.

More than any other species, humans are capable of learning new things. Indeed, the majority, but not fully, of what distinguishes us from other animals is anchored in language.

In addition, because we have a backbone, humans are considered to be members of the chordate animal phylum.

The zygote is split into the blastula after fertilization, three germ layers develop in the blastula, which in some species is a hollow ball of cells, during a process known as gastrulation.

Therefore, humans are classified as members of the primate order within the animal group and having the blastula stage, hence option a is correct.

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Answer:

The correct answer is - natural selection, population.

Explanation:

In this case, the wild bees population experienced a mutation which helps in become more eeficient to fight for nector. This bees population is more sucessful to other that didnt recieved mutation and this mutation as it is adavtageous.

Natural selection always favored beneficial traits for the organisms to eveolved in generation therefore, these population is more succesful and replaced the short winged bees.

Answer:

Explanation:

Diploid - Having pairs of chromosomes

Chromosome - A strand of DNA wrapped around a protein

Haploid - Having only one set of unique chromosomes

DNA - The molecule that carries genetic information

Sex Chromosome - An X or Y chromosome

Homologous Chromosome - A pair of chromosomes that contain information for the same traits

Answer: the answer would be C

Sodium ion do not leave at the beginning of the nerve impulse.

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Answer:

Explanation:

A benign tumor isn’t cancerous while a miligment tumor is

Answer:

Ribosomes are complex molecular machines in living cells that produce proteins from amino acids in a process known as protein synthesis or transformation. The process of protein synthesis is a primary function performed by all living cells.

So I think the answer is ribosome

Explanation:

Answer:

C biological control.

Explanation:

Biological control because a natural organism is controling pest. Unlike using pesticides. That would be chemical control. lol

Answer:

C. Biological Control

Explanation:

The use of biological beings such as organisms to control pest andm uch more is considered to be Biological Control

Answer:

mallard ducks I think so

Answer:

D.

Explanation:

Galapagos tortoises have been and continue to be threatened by predation and habitat destruction from invasive species, and increasing human

Answer:

C The sarcomere is contracted, and the actin and myosin filaments are completely overlapped.

Explanation:

In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing calcium into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament.  Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

In the sarcomere, which is the contractile unit of skeletal muscles, there are

When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in the length of the sarcomere. The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. A band keeps constant in length. This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.

Answer:

C

Explanation:

edge 2021

Answer:

Provide suitable place, making laws and reduce pollution.

Explanation:

Provide suitable place where they can breed without disturbance, making laws to forbit hunting of endangered species and reduce pollution are the different methods that can protect endangered species of animals and plants around the world. For increase in population, suitable environment is required so that they have no predators or other factor that adversely affect their growth. The laws to forbit hunting or killing has also a significant effect on endangered species. Pollution is the main reason for change in the environment that make the environment not suitable for animals and plants.

Answer:

This question lacks options, the options are;

A. Enlarged molecules

B. Macromolecules

C. Inorganic molecules

The answer is B

Explanation:

As mentioned in this question, carbohydrates, proteins, lipids, and nucleic acids are the basic biomolecules found in nature. They are all polymeric substances, hence, are made up of smaller units called monomers.

Asides from being biomolecules, these four molecules are also referred to as MACROMOLECULES based on their large size and complex nature. Macromolecules are molecules that are relatively large in size composing of an aggregate of monomer. Hence, these biomolecules are macromolecules.

Answer:

food shelter water

Explanation:

food shelter water

Answer:

Why Nepal is favourable for sericulture

Explanation:

Mysuru and North Bengaluru in Karnataka are famous for their silks and are called the “Silk City” as they majorly contribute to the silk production in India

Answer:

Coal and petroleum.

Explanation:

Coal and petroleum are the two examples that can be converted into fossil fuel after being buried under pressure for a long period of time. Both coal and petroleum formed underground with the presence of very high temperature and pressure. Coal is formed when the plant material is placed under high temperature and pressure for thousand of years while on the other hand, petroleum formed when dead bodies of animals are present underground for a very long time with a suitable pressure and temperature turn into petroleum.

Answer: they don't have a reproductive system

Explanation:

Fungus is the organism in the food web displayed in the image in the first trophic level of the ecosystem.

Trophic level is defined as the position of an organism in the food chain or food web.

The trophic level consists of organisms at different levels. The first trophic level is made up of producers that initiate the transfer of energy.

According to this question, an image showing a food web is given. The first trophic level in this food web is the fungus because it starts the energy transfer.

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