An animal was first maintained in a constant environmental condition for several days until a consistent biological rhythm  (B) was established. The animal was then exposed to an experimental physical rhythm (E) which modulates the phase and  period of B. However, upon withdrawal of E, the B gradually regained its pattern of pre-exposure condition. From these  observations which one of more of the following should be the most logical inference?

An animal was first maintained in a constant environmental condition for several days until a consistent biological rhythm (B) was established. The animal was then exposed to an experimental physical rhythm (E) which modulates the phase and period of B. However, upon withdrawal of E, the B gradually regained its pattern of pre-exposure condition. From these observations which one of more of the following should be the most logical inference? A.E is a Zeitgeber B. E is a masking agent C. E causes entrainment of B D. B is a conditioned to E The correct answer is

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M.Sc. Entrance

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