What is the basic difference between volvox and other protists, such as amoeba, paramecium, and euglena?

There are a number of differences between these organisms and these are as follows:

1) Reproduction

Amoeba: Asexual

Paramecium: Sexual by conjugation

Euglena: Asexual

2) Nutrition

Amoeba: Heterotroph by phagocytosis

Paramecium: Heterotroph by predation

Euglena: Autotroph by photosynthesis and heterotroph by ingestion

3) Locomotion

Amoeba: Pseudopodia

Paramecium: Cilia

Euglena: Flagella

Hope this answers the question. Have a nice day.