Concept:The diagram shows a colonial green alga with many flagellated cells arranged in a hollow sphere.
Explanation:The organism appears as a spherical colony, not a single cell.
It contains numerous biflagellate, pear-shaped cells embedded in a gelatinous matrix.
This type of colonial body is called a coenobium.
Chlamydomonas and Euglena are single-celled organisms, so they cannot form such a colony.
Algae is a general group, not the specific name of this organism.
The visible structure is therefore characteristic of Volvox.
Answer:C. volvox
