It has been proposed that mitochondria and chloroplasts are modern descendants of early prokaryotic cells that began to reside and gradually involved within prumitive cells which statement supports this view

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

im not intirely sure but i think the anwser is d relative humidity