Garlic and Onions
Rome was noted for its crime bad food scorpions and mosquitoes.
Mosquitoes and butterflies use their proboscis to collect food. This works like a long, thin straw and sucks the nectar out of flowers. When not in use, the proboscis curls up into a ball shape.
It's nature. According to your question, I can assume that you think that things of nature exist for a purpose. That's not true. For example, why do dogs exist? Mosquitoes are part of a natural balance of creatures, sort of like a food chain or food web, so many other creatures would die if their main food source, mosquitoes, died out. BLA BLA BLA...
insectisides,pesticides,chemicals like ddt etc. kill mosquitoes
No
they eat food
bottom
how mosquito digest their food
Some common bugs that look like mosquitoes include crane flies, midges, and mayflies. These insects may resemble mosquitoes in size and appearance, but they do not bite or feed on blood like mosquitoes do.
Ptarmigans only eat plants, so their food can't eat mosquitoes!
Mosquitoes don't have the reputation for harming food. They pass along diseases through their bite and do not feed from food on a plate. Mosquitoes could land in a beverage thinking it a good spot to lay eggs, but they are not there to feed- - though I'd probably replace my beverage if a mosquito landed in it. Flies (like the ordinary housefly or bottle flies) will feed off of dung then carry microbes to your food.
They have no 'use' other than food for spiders in the food chain.