Practice question
Question
In an area where DDT had been used extensively, the population of birds declined significantly because:
Explanation
DDT biomagnifies and accumulates in avian tissues, disrupting calcium metabolism and inhibiting calcium-ATPase in shell glands. This causes thin, fragile eggshells that crack under incubation, preventing hatching rather than stopping egg production, leading to dramatic population declines in birds like raptors and pelicans.
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