Different animals have different adaptations due to their habitat, which help them survive. For example, the camel located in deserts have 2 humps where fat is stored which can be metabolised for energy.
The best and most correct answer among the choices provided by your question is the second choice.
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Introns are functional proteins that would contain the information contained within which of the following regions of DNA.</span>
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Clonal selection of lymphocytes leads to the development of Effector cells and Memory Cells.
In danger, they cannot fly for a longer time unlike the other birds. Their long,heavy tails make it a bit difficult. However their flight lasts for some seconds .