The answer is A. The vascular system, filled with vascular tissue, are the crucial conduits through which water and nutrients flow through plants. Without them plants are limited to being a few inches (centimeters) tall. Leaves that get sunlight have nothing to do with a plants height.
Well the male bird is a dominant (long beak) and the female is a recessive(small beak.) we can assume that the female birds genotype is ii and the male birds genotype is LL or Li. When it comes to the offspring we can assume that the offspring would have a long beak. The offspring would either have the dominant (father) genes.
C...the key is that they are photosynthetic...so they produce oxygen (like plants)!
