Certain Protists Have a Contractile Vacuole, Which Collects and Expels

Multiple Choice

Certain protists have a contractile vacuole, which collects and expels excess pure water (H₂O) .This is most useful for

A) slime molds locomoting on dry land.
B) protists in salt water maintaining a hypotonic internal environment.
C) dinoflagellates evading predators.
D) protists in fresh water maintaining a hypertonic internal environment.
E) radiolarians moving by jet propulsion.