Answer:
The correct option is <u><em>A. they evolved from land mammals.</em></u>
Explanation:
The process of evolution explains how closely one organism is to another based on their common ancestors. Scientists believe that those organisms which show many similarities in their structures or functions might have evolved from a common ancestor in the past.
As in the above-mentioned question, scientists have observed that cetaceans lack gills and breath air, this is a property of land mammals. The cetaceans have fin bones which are similar to the limb bones. As limb bones are present in land mammals, hence they cetaceans and land mammals might have common ancestors in the past.
Why Earth's inner core<span> has speed trap for </span>seismic waves<span>. </span>Earth<span> has multiple layers: the crust, the mantle, the liquid </span>outer core<span> and the </span>solid inner core<span>. Something is not quite right inside the </span>Earth's core<span>. When </span>seismic waves<span> from earthquakes ripple through its </span>solid<span> center, they hit a speed bump.</span>
<span>monosaccharides for the strength
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Answer:
So the soil can be heathy and and grow stuff like food, trees, things that are necessary for survival.
Answer:
Group behavior, also known as collective behavior, <u>can increase the chances for a species to survive and reproduce because they can rely on each other to accomplish behaviors that are crucial for their survival, such as hunting, migrating, and breeding.</u>
Explanation:
According to ethologists, social species highly depend on the members of their own group for survival. One perfect example is the case of <u>schooling fish</u>. These small species of fish gather in a whole large group and navigate long distances while looking for food. Researchers from Princeton University <u>discovered that their orientation capabilities increased when more individuals joined the group, making them more responsive to the environment.</u>
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Moreover, there have been numerous sources of evidence that demonstrate that <u>orcas (killer whales)</u><u>,</u> which are extremely social creatures<u>, create large pods of around 20 to 30 individuals and 'plan' strategies to hunt. Also, older females swim along younger individuals to teach them hunting skills that are crucial for their survival.</u>
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In addition, <u>herbivores</u>, like zebras, <u>are usually found in large groups because it lowers the possibilities of being individually targeted by apex predators, such as lions.</u>
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Recently, researchers have also discovered that <u>migrating species</u><u> often rely on each other to improve their migrating capabilities by producing or generating social cues that allow them to improve their orientation or in cases when environmental conditions get tough</u> (Source).
In conclusion, these lines of evidence show that social organisms who travel in groups rely on all members to carry out important behaviors that, without them, would provoke an important decline in their populations because they wouldn't be able to reproduce or feed individually as successfully as they would with the 'help' of the members of the group.
- Couzin, I.D. (2018) Collective animal migration, <em>Current Biology </em>28(17), R976-980.
