Answer: positive feedback loops enhance or amplify changes. this tends to move a system away from its equilibrium state and make it more unstable. Negative feedbacks tend to dampen or buffer changes. this tends to hold a system to some equilibrium state making it more stable.
Explanation:
A. Community.
This is because a community contains living this, and biotic means living.
dominant trait is opposed to a recessive trait which is expressed only when two copies of the gene are present.
Mainly by nitrogen-fixing bacteria in the soil and oceans
