Microfossils often present in petroleum-producing formations are those of:

The diatom frustule or shell is made of:

Which kingdom consists of organisms that are simple,predominantly aquatic,and unicellular eukaryotes?

Diatomaceous earth is used as a heat insulator in boilers and steam pipes because the cell wall of diatoms-

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 $Z$.

Describe the body organization of ciliated protozoans.