The arrows in the illustration are pointing to a) homozygous alleles on homologous chromosomes. b) homozygous alleles on homozygous chromosomes. c) heterozygous alleles on homologous chromosomes. eliminate d) heterozygous alleles on heterozygous chromosomes.

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

thinking it would be d not too sure but i think it's right