question_answer

Two species of Amoeba X and Y were kept in fresh water and got adapted. Species X developed contractile vacuole. When both were transferred to sea water and got adapted, both X and Y lost their contractile vacuole. From these observation we conclude that                      [AFMC 1983, AIIMS 1983]

A)            Both X and Y are marine species

B)            Species Y is marine and X is fresh water

C)          Species X is marine and Y is fresh water

D)            Both X and Y are fresh water