Plasmodium, the apicomplexan that causes malaria, enters the human bloodstream through the bite of which parasitic protozoan?

A biologist was studying some groups of protozoa when he noticed details of some of the organisms of this kingdom, which one pair is mismatched?

A Dutch scientist first observed very small creatures in:

A group of producers second only to diatoms

A sessile ciliate

A student studied a drop of pond water with the low power of compound microscope and made the following exact drawing of an organism she observed, Which kingdom is the organism classified as?