Herons must eat large numbers of fish to survive. Therefore, according to naturalists, when many herons nest near each other in a marsh, large numbers of fish must be available to them. But many herons successfully nest in the Pahargaon marsh, and that marsh has been nearly empty of fish for many years.
Which one of the following, if true, most helps to reconcile the apparent discrepancy described above?
(A) Pesticides used on nearby farms have seeped into the waters of the Pahargaon marsh and
...
Which one of the following, if true, most helps to reconcile the apparent discrepancy described above?
(A) Pesticides used on nearby farms have seeped into the waters of the Pahargaon marsh and
...
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