What factor is often responsible for the other three 1 increase in levels of toxins in freshwater

2 increased poverty and malnutrition

3 increase in human population

4 increased depletion of finite resources

I think it's 4 hope it's correct

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.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%