Acid precipitation is caused by a mix of
a. sulfur dioxide, carbon dioxide, and nitrogen oxides.
b. respiration, carbonic acids, and seawater.
c. hydrogen, oxygen, and saline.
d. water, soil, and air.

because the light is a great source of energy for the plants to survive. (i hope this )

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