Energy is needed to cause a change in the state of matter because adding energy to matter causes a physical change as matter moves from stage to another.
The gametophyte era starts with a score created by meiosis. The spore is haploid, and every one of the cells gotten from it is likewise haploid. At the appointed time, this multicellular structure produces gametes — by mitosis — and sexual proliferation then creates the diploid sporophyte era.
D. Hypotheses is the correct answer
