Final answer:
Mosquitoes buzz in people's ears because the rapid beating of their wings produces sound waves. Female mosquitoes are attracted to carbon dioxide and body heat, seeking blood to develop fertile eggs.
Step-by-step explanation:
The question why do mosquitoes buzz in people's ears relates to the biology and behavior of mosquitoes. Mosquitoes buzz in people's ears, and around them in general, due to the rapid beating of their wings, which creates sound waves perceptible to the human ear. The females buzz around people because they are attracted to the carbon dioxide we exhale, body heat, and other chemicals, as they need blood to develop fertile eggs.