Extinction is a natural process that may be caused by natural selection, shortage of food or natural calamities. Hunting, deforestation, pollution, the conversion of uncultivated areas into pastures, the illicit trade of wild animals as well as climatic changes have made life more difficult for many animals.
Hibernation is when an animal hides away during the winter. They stock up with food before hand and sleep all winter. This is a survival tactic.
Answer:
they are made from amino acids