Proteins are formed from monomers called amino acids. These are naturally found substances that polymerize in order to form proteins. These are compounds which has amine and carboxyl groups and are characterized by an R-group. In proteins, there are about 20 amino acids that can be found.
A population that has been isolated, especially a smaller one, could have a high level of homozygosity and therefore not a lot of genetic variation. Gene flow between such populations can increase the level of heterozygosity, and therefore up genetic variation.
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D) Apes and chimpanzees are thought to have evolved from a common ancestor.
The 3 domains are bacteria, archaea, and eukarya. The domain bacteria consists of the kingdom 'bacteria'. The domain archaea consists of the kingdom 'archaea.' The domain eukarya consists of the kingdoms 'plantae', 'animalia', 'fungi', and 'protista.'