I think the answer is c but I looked it up and got this: system or thing used as an example to follow or imitate.
Climate, Land form/shape and fossils(he was most interested in this)
When too much water is pumped out of an aquifer, you can make a sink hole above it, as there is now air/empty space where water used to be.
Cyclic phosphorylation is a kind of phosphorylation in which ATP is formed from an ADP when phosphate group is attached to it during light reaction of photosynthesis.
Explanation:
nitrogen is converted from atmospheric nitrogen +N2) into usable forms ,such as NO2,- in a process known as fixation.
