Which of the following describes how dna provides evidence to support that life changes over time

a- some animals exhibit similar stages of embryonic development
b- some animals exhibit structural that are no longer used for any purpose
c- some animals exhibit similar genetic code

Although all are true, it is B.

Vestigial structures indicate that the animals evolved from an ancient ancestor.

not sure but try c two haploid cells

explanation:

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.