I believe they cannot start with big trees and bushes because the there is not enough nutrients in the soil, so instead pioneer species pave the way for primary succession.
Answer:D( Ribosomes
Explanation: Since most enzymes are proteins, it will be produced at the ribosomes. It may have an active and an inactive form. Which means another substance Will turn it on or off.
I think that the bright light would be the "stimulus" and the pupil constricting would be the "response".
They make some of the proteins needed for photosynthesis , they are arranged in structures which allow maximum absorption of light every
