Studies indicate that global warming has caused a shift in the migratory patterns of some bird species. such changes in migration patterns may have adverse effects on some bird populations because a) scientists are no longer able to study the migratory habits of these birds. b) bird species from the south have started flying north during winter, reversing the original trend. c) the birds may arrive too early or too late to take advantage of the peak numbers of their insect preys. d) some species of birds have stopped migrating due to more suitable conditions at their place of origin.

The correct answer is option C.

Explanation:

Global warming has diverse negative effect on several ways to the environment and organism and crops. One of the important shift is, a change in the migratory pattern of some of the birds. This change in the migrating pattern of the birds has a diverse effect on the population of the birds.

Birds are moving early or late to their feeding ground and also did not move far. Migrating too early could end in less food at their migrating site or moving to not far south also let them assume it is the destination and end in fewer insects or food.

Thus, the correct answer is option C.

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