Which sentence best summarizes the main idea in the second paragraph of the passage?
Fish and dragonfly nymphs can spell trouble for mosquitos, especially in lakes. Male mosquitoes do not bite, but they do require blood meals to fertilize eggs. More than 200 species of mosquito develop through a four-stage life cycle. When rainwater collects, it can flood mosquito eggs, unless they're in a pond or lake.

Question

Which sentence best summarizes the main idea in the second paragraph of the passage? 
 Fish and dragonfly nymphs can spell trouble for mosquitos, especially in lakes.  Male mosquitoes do not bite, but they do require blood meals to fertilize eggs.  More than 200 species of mosquito develop through a four-stage life cycle.  When rainwater collects, it can flood mosquito eggs, unless they're in a pond or lake.