Answer:Their carbon skeletons are held together by covalent bonds
Explanation:They form the cells of an organism and perform the chemical reactions that facilitate life
The sequence of species in which they disappear, in order from least to most severe would be: B. Threatened-Endangered-Extinct.
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Answer:
An otter's den is called a holt or couch.
Explanation: Otters are found almost all over the world and in many wet habitats, such freshwater rivers, lakes, oceans, coastlines and marshes. Most otters live in dens — built by other animals, such as beavers — that are dug into the ground that have many channels and dry inner chambers
The molars are responsible for masticating the most, otherwise known as mechanical digestion.
