Which of the following statements about eutrophication is not true?
(a) it is caused by acid rain.
(b) it is caused by the addition of nutrients to a water system.
(c) it is most harmful when there is little flow through in the system.
(d) phosphorus is the main causal agent.
(e) humans are responsible for most eutrophication.

answer: 45

explanationyou have to add as well to be it could be

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.