It measures the total rate at which photosynthesis or chemosynthesis happens in a system.
Answer:
The effect of an external physical factor on cell division is clearly seen in density-dependent inhibition, a phenomenon in which crowded cells stop dividing. ... When cells have formed a complete single layer, they stop dividing (density-dependent inhibition).
Explanation:
The fossil record shows that life found on earth before was much different from life found on earth today.
Just to add on over time they have develiped a tuff outer layer to stop weather and insects from harming them.
The answer is Natural selection Hope it Helps
