Adityagmatclub wrote:
From the passage
Critics of the theory have pointed out that the abundance of grains in the beak are not concentrated.
Critics of magnetite-centric theories suggest a second theory: that the magnetic field of the Earth has an influence on a chemical reaction in birds, specifically in a bird's retina.
from above information Answer will be B.
Yes, so the answer should be D. B does not make any sense at all. B is suggested by the proponents of the first theory an opposed by the critics.
Answer
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