What is the model organism used to study fundamental biological processes like growth, differentiation, cytoplasmic streaming, and cytoskeleton function?

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 large group of parasitic protozoa, some of which causes various diseases such as malaria to humans, are:

A protist that forms sea-weeds is: