Special type of red pigment present in the eye-spot of Euglena and Crustacea is called:

Which kingdom includes unicellular or multicellular eukaryotic organisms?

What does '$A$' represent in the given figure?

Select the correct option for the following statements:
$(i)$ The sea appears red or golden when red dinoflagellates multiply rapidly.
$(ii)$ $Euglena$ / $Slime$ $molds$ are saprophytic protists.

The causal organism for African sleeping sickness is

Diatomaceous earth is used to insulate boilers and steam pipes because: