$A$ unicellular organism often considered a connecting link between plants and animals is

The main cause of water blooms observed in rivers,lakes,and seas is .......

Which of the following is not true for $Euglena$?

Two species of Amoeba $X$ and $Y$ were kept in fresh water and adapted to it. Species $X$ developed a contractile vacuole. When both were transferred to sea water and adapted, both $X$ and $Y$ lost their contractile vacuole. From these observations, we conclude that:

Write the characteristics of Ciliated protozoans.

Organisms belonging to the phylum Protozoa move using which of the following structures?