When does the movement of materials in and out of the cell not require energy?

Answer : Passive transport mechanism Explanation: Passive and Active transport mechanisms are the two types of transport mechanisms by which molecules move in and out of the cell membranes. Passive Transport mechanisms do not require energy from cells. The movement of the molecules from High to Low concentration requires no energy. E.g. Osmosis, simple and facilitated diffusion.

The answer is reflection.

The answer would be semen as a whole but the cells contained are called sperm and they fertilize the eggi hope this