Which of the following is $NOT$ a method of asexual reproduction in the kingdom Protista?

$A$ stiff cell wall and biflagellate cells are characteristic features of which group?

The presence of cilia, an oral groove, and food vacuoles, and the absence of chloroplasts in a unicellular organism indicate that the organism carries on

In $Amoeba$ and $Paramecium$,osmoregulation occurs through . . . . . . .

Diatoms are not easily destroyed like other algae because-

Protists are