The correction option is B. The plants that belong to phyllum anthophyta are heterosporous, that is, they produce both male and female reproductive organs separately. Fruits grow when the male gamete fertilizes the female ovary. Their fruits are always fleshy with seeds inside them. A good example of a plant that belong to this phylum is pawpaw.
B, the independent variable because this is the one that is purposefully changed in an experiment to test the hypothesis.
The answer to this is rolling friction
The waste products of respiration are Co2 and H20.