The phosphorylation of adp to form atp is an reaction that energy.

1. Endergonic

2. Input of

Explanation:

ATP has three terminal phosphates bonded to a ribose which in turn is bonded to adenine. Loss of one terminal phosphate converts ATP into ADP and plenty of energy is released to drive other processes. On the other hand, phosphorylation of ADP into ATP is an endergonic reaction and requires a source of energy to occur. During oxidative phosphorylation, the proton motive force across the inner mitochondrial membrane drives the ADP phosphorylation.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.