The condition common to protozoa whereby the cell of the organism acts as a gamete is isogamy. It is <span>a condition in which the sexual cells, or gametes, are of the same form and size and are usually indistinguishable from each other. Hope this answers the question.</span>
No they can not unlike humans and animal
Google said hydrogen so I'm guessing B. gases
Cells need water to survive for a dispose of waste