How/where was CRISPR initially discovered? A. It is part of a bacteria's immune system.
B. It helps recognize invading viruses and cuts up their DNA.
C. It was made in the lab by scientists at Stanford University.
D. It's found naturally in viruses.
E. It helps them to invade bacteria and destroy their DNA.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.