They require shallow waters where the sun can reach them!
A unicellular or single celled organism is the term for organisms composed of only one cell.
I hope this helped!
Answer:
Choloroplast
Explanation:
The choloroplast hosts the enzymatic machinery that carries out photosynthesis. These proteins are embedded in the thylakoid membranes of the chloroplast. Of these proteins PSII and PSI contain chlorophyll molecules.