In ...............,cilia help in the movement of food through the cytopharynx and in locomotion.

In which animal phylum is the organism $Opalina$ classified?

The cell wall of diatoms is composed of .........

Protozoans are not included in kingdom $Animalia$ because they are

An $X$ reproduces in such great numbers that the water may appear red,producing red tides and killing large marine animals like $Z$. $X$ belongs to $Y$. Identify $X$,$Y$,and $Z$.

The maximum biomass of living diatoms is found in: