Q.

The release of which of the following into ponds and wells helps in controlling mosquitoes?

A. Snaii
B. Crab
C. Dogfish
D. Gambusia fish
Answer» D. Gambusia fish
Explanation: The Gambusia fish, also known as mosquito fish, feeds on the larvae of mosquitoes. So it helps in controlling their population. Mosquito fish were introduced directly into ecosystems in many parts of the world as a bio- control to lower mosquito populations which in turn negatively affected many other species in each distinct bioregion.
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