1.

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
Answer» D. Both X and Y are fresh water


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