Quick I need help this mutation reinforcement assignment about DNA, RNA, and amino acid.

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

What are some things that limit population growth?

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.