Truth water at the top has energy
I am pretty sure that the thing which most likely happen to plants if they did not have a waxy outer coating is being revealed by the last option D. They would be harmed by insects and UV radiation. Every plant has to be protected by membrane so that it would be able to deal with drought small invaders and other external forces.
When the M phase begins during the cell cycle, it starts with prophase
The planet would be Neptune and Earth's average time is 365.2 days aka a full year (1 year).