If the field of view in this image is 220 um, the size of one of the cells is um.
(record your answer to 2 sig digs)

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

i would think it's dendrites