Trypanosoma brucei produces

Some dinoflagellates secrete toxins (saxitoxin) that enter the human body through the food chain and result in ........

Oil and leucosin are characteristic stored food in ....

The first evolved eukaryotes are:

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.

Which of the following is responsible for the 'Red tide' phenomenon?