Experts have learned many things aboutmosquitoes. For example, the insects can smell carbon dioxide in the breath of a person or animal from asfar away as sixty miters. They do not bite women who are having their monthly period of bleeding. But they do bite pregnant women. Many kinds of mosquitoes are mostactive in the early morning and evening hours. Medical experts say the best wayto prevent the diseases carriedby mosquitoes is not to be bitten by one.

Experts have learned many things aboutmosquitoes. For example, the insects can smell ( carbon dioxide) in the ( breath) of a person or animal from asfar away as sixty miters. They do not bite women who are having their monthly ( period) of bleeding. But they do bite (pregnant) women. Many kinds of mosquitoes are mostactive in the early morning and evening hours. Medical experts say the best wayto prevent the (diseases) carriedby mosquitoes is not to be (bitten) by one.