Which of these is the best example of a positive feedback loop in Earth's climate system?
A. As the number of plants decreases, the amount of CO2 decreases.

B. High clouds have a high albedo and reflect solar energy back into
space.

C. High precipitation results in increased plant growth, lowering CO2-

D. As climate warms, CO2 increases because plants remove less of
it.

C) High precipitation results in increased plant growth, lowering CO2 levels

b. the carbon cycle ensures living things have a source of hydrogen

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products