Original sentence: Mosquitoes use their proboscis to prick the skin and suck blood.
Corrected sentence: Mosquitoes use their proboscis to pierce the skin and suck blood.
Other correct option (singular): A mosquito uses its proboscis to pierce the skin and suck blood.
Why this is better (simple steps):
- "Mosquitoes" is plural, so "use" is the correct verb form.
- "Pierce the skin" is a clearer choice than "prick the skin." Both are understandable, but "pierce" fits better here.
- "Their proboscis" is okay for a group, but you can also say "their proboscises" or use the singular form "A mosquito... its proboscis."
Kid-friendly version: A mosquito pokes your skin with its tiny mouth and drinks a little blood.