$Entamoeba$ differs from $Amoeba$ in not having:

"Diatomite" (Kieselguhr) is obtained from which of the following?

Which of the following parasites causes the disease known as $Sleeping \text{ } Sickness$?

During conjugation in $Paramecium$,which of the following events occurs?

The given statements are some characters of a particular group of Kingdom $Protista$.
$(i)$ Most of them are freshwater organisms found in standing water.
$(ii)$ They have a protein-rich layer (called pellicle) which makes their body flexible.
$(iii)$ They have two flagella,a short and a long one.
$(iv)$ Though they are photosynthetic in the presence of sunlight,but in the absence of sunlight they behave like heterotrophs by predating on other smaller organisms.
Identify the correct group on the basis of these characters.

Amoeba stops producing pseudopodia during