Answer:
Yes.
Explanation:
In fact, photons are the only things that humans can directly see. Human eyes are specifically designed to detect light. This happens when a photon enters the eye and is absorbed by one of the rod or cone cells that cover the retina on the inner back surface of the eye.
Protists obtain food in one of three ways: absorption, ingestion, and engulfing. Most protozoa are free-living in soil and water and enter the activated sludge process through inflow and infiltration. Bacteria are the primary food source for protozoa
