[Answer] 3. The use of the chemical DDT had an impact on the bittern. What was it?

Step 1 : Introduction to the question "3. The use of the chemical DDT had an impact on the bittern. What was it?"

...1. increased the number of birds 2. changed its color 3. made the female lay eggs with thinner shells 4. made the birds larger Scientists found that the number of fish-eating birds dropped in the 1960's. The cause was eggs that broke before the chicks were ready to hatch. Following the life cycle, mosquitos killed by poisonous chemicals were eaten by fish which were in turn eaten by birds like the bittern, affecting their egg shells.

Step 2 : Answer to the question "3. The use of the chemical DDT had an impact on the bittern. What was it?"

made the female lay eggs with thinner shells:

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