African sleeping sickness or Gambiense fever is caused by

They are responsible for sleeping sickness.

In which of the following is a contractile vacuole present?

Which of the following are the characters of dinoflagellates?
$(i)$ They are planktonic golden yellow algae with soap box like structure.
$(ii)$ They are marine biflagellated protista.
$(iii)$ They appear yellow,green,brown,blue and red in colour.
$(iv)$ The cell wall has stiff cellulose plates on the outer surface.
$(v)$ They are saprophytic (or) parasitic unicellular forms.

The accumulation of dead remains of diatoms at the bottom of the ocean is known as ...........

Euglena belongs to which kingdom?