Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.
Answer:
<u><em>External Factors:</em></u>
The external factors which influence the cell cycle might be physical or chemical.
Physical factors: Physical signals involve the factors like when a cell touches another cell, it stops dividing.
Chemical factors: Chemical factors are the growth factors or growth proteins that trigger the cells to undergo the process of cell division.
<u><em>Internal factors:</em></u>
Kinases: Kinases are the proteins which determine whether the cell will undergo cell division or abort it.
Cyclins: When the signal is right for cell division, cyclins activate the kinases.
See below itemized similarities and differences of surface and subsurface waters.
SURFACE WATER
Input: Through precipitation. When precipitation falls, its a runoff when it doesn't seep into the ground.
Output: Rivers or streams
Storage: Watersheds
SUBSURFACE WATER
Input: Precipitation through recharging process.
Output: When atmospheric pressure above ground is lower than subsurface water pressure it flows as rivers, streams and becomes a source of drinking water or irrigation water in farming.
Storage: Acquifers, rock layer that holds water.