There are many different factors, but some are: the amount of natural resources (food, water, etc.), amount of predator/prey, and availability of shelter.
B 5 years it takes 5 years before symptoms to appear
I think it is but i downt know
The main pigment of plants is "chlorophyll," which gives the green color characteristic of most vegetables, absorbs very well the light in the bands of red and violet, reflecting the green light.
You can eat starch, but you can't digest cellulose