Why is the sequence of dna important?
a.
it is used to create copies of cells.
b.
it makes sure there will be no mistakes in the information.
c.
it determines protein structure.
d.
it is needed to build new kinds of organisms.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

sex cells are usually half's then they find another half and make a fertilize egg