How does phase contrast microscopy scientists to visualize difficult specimens?

The asnwer is Allows observation and study of living cells.

Explanation:

The phase contrast microscope allows observation of uncolored cells, which is very useful for the study of living cells. This type of procedure helps scientists study difficult samples, because most living organisms cannot be dyed or colored, since the dyes used could damage their cell structure and even cause them to die.

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.

digestion

it excretes wastes