In which of the following are a group of amoeboid cells found?

Which life forms are observed in Protista?

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.

In which form is the kingdom $Protista$ not observed?

The link between prokaryotes and multicellular eukaryotes is ......... .

The protist in which the cell size decreases with each division is $.......$.