Symmetry found in $Volvox$ is

They do not perform photosynthesis and primarily obtain nutrition through ingestion.

Identify the correct sequence of various levels of organization observed in members of the Kingdom $Animalia$.

The type of symmetry in which the body of an animal can be divided into two identical left and right halves by only one plane is called:

In the given chart, what do "a" and "b" represent respectively?

How useful is the study of the nature of body cavity and coelom in the classification of animals?