I would think that the answer would be C! Good Luck, tell me if it's correct please! :D
Yes because I think that more-complex cells need the chromosomes for help
The answer is Chordates
Most of the chordates have a symmetrical bilateral body which differentiated into head, trunk and tail
The example of chordates are parrot, penguin, horse , squirell, clown fish ( the one in finding nemo), sharks, etc