I'm pretty sure the answer is water :)
Answer:
In simple cuboidal epithelium, the nucleus of the box-like cells appears round and is generally located near the center of the cell.
The environment includes abiotic (nonliving) and biotic (living) factors. An ecosystem consists of all the biotic and abiotic factors in an area and their interactions
The answer is
C. The way the layer interacts with the layer below it.
