I believe the last option is the correct one for the illustration of the single celled organism provides and the environment that it is found living in.
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.
Altered reciprocal inhibition <span>is caused by a tight agonist muscle decreasing the neural drive to its functional antagonist. Altered reciprocal inhibition changes the relationships of force pairs, resulting in equal superiority, resulting in further non-functioning patterns in movement, muscle control on a neurological level, and specifically malfunction of joints. </span>
The purpose of an indicator is to test how acidic or basic something is.