Why are birds that inhabit areas with high acid deposition more likely to lay eggs with thin shells?

a. acid deposition acts as an endocrine disruptor that interferes with reproductive hormones in bird species.

b. high rates of cancer due to acid deposition impact birds ability to form eggs.

c. in acidic soils calcium, an important nutrient for eggshell production, washes away and so less is available to birds in their diets

d. acid deposition increases the effects of ddt which has already been implicated in thinning eggshells?

C

Explanation:

When it precipitates, the acid in the soil becomes dissolved forming an acidic solution. The low pH solution dissolves the calcium ions in the soil washing them away in runoffs and also leaching them deeper into the soil. This depletes the calcium ions hence making them unavailable to the birds. Calcium intake is important in birds because the ion is a significant component of eggs shells  (makes them strong and not brittle hence the eggs don’t break easily)..

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