The dominant allele "overpowers" the recessive allele, therefore that trait shows. In this case, it is the polled allele. Therefore, the heterozygous pair works. Also, the homozygous pair with only the dominant allele (polled) will of course work since that is the only gene.
Most animals in Animalia have backbones, but not all. The correct answer would be C, because all organisms in Animalia are heterotrophs which means that they depend on other organisms (like animals and plants) for food.
