A for you'res but for mine the answer was
Its absence would affect many organisms in the community
<span>The main light-absorbing pigment for photosynthesis is known as chlorophyll. This light absorbing pigment is found in many organisms, primarily in a variety of plant and bacteria species. Chlorophyll is necessary because it allows the light to be absorbed and allow energy to be absorbed by the organism in order to carry out a multitude of metabolic processes.</span>
A population of organisms must exist. There must be variation among the members of the population. There must be a mechanism by which some members of the population can produce more offspring than other members. There must be a mechanism by which the variation among members of the population is passed on to their offspring.
I know that increased temperature and concentration increases the rate of enzyme activity. Through deductive reasoning, I can conclude that lower ph must qualify as well.
Through logic, I will say "All of the above" or answer D is the best.