The backbone is made of many small units of bone or cartilage. what is each unit called? a vertebrate a vertebrae a vertebra a vertebral

Which codon is the code for the amino acid histidine (his)?

Which is an example of a population?

Which short-term environmental changes would a very small asteroid or comet impact on earth most likely cause? check all that apply. flooding extinction craters on surface changes in weather patterns death of organisms and populations