Answer:
It's C. They are mostly made up of hydrogen and helium
Https://www.reference.com/science/plant-cells-bigger-vacuoles-animal-cells-6ce1d958f161267a#
This site has a very complete answer that is very thorough.
It is related to natural cycles which affect activities of ecosystems natural energy conversion can help maintain and restore balance.
<span>lose materials, rock fragments, mineral grains moved by wind water ice or gravity</span>
