Answer:
d
Explanation:
biotic factor also limit population growth
When the concentration gradient of such molecules is high on the either the cytoplasmic side or the extracellular side of the cell. When the concentration gradient is high it flows freely through the cell membrane to the other side without expanding energy.
Hope i helped!
It’s a heterotroph!!!! You’re welcome!
its d . electron because it has a negative charge of however many there are that are circling the atom