Question

the simple one - celled organism seen here, an amoeba, moves by streaming its cytoplasm into false feet or pseudopods. amoeba can easily change shape because two - thirds of the mass of the cell is
a air
b water
c the cytoskeleton.
d a contractile vacuole.

Explanation:

Amoebas can change shape easily because about two - thirds of the cell mass is water. Water provides fluidity to the cell, enabling the formation of pseudopods. Art is unrelated. The cytoskeleton provides structure and the contractile vacuole is for osmoregulation, not the main reason for shape - changing.

Answer:

B. water