Question

why mosquito has only blood as food​

Answer 1

Answer:

In many species, the female needs to obtain nutrients from a blood meal before it can produce eggs, whereas in many other species, obtaining nutrients from a blood meal only makes it so that the mosquito can lay more eggs.

Explanation:

Answer 2

Blood is full of proteins and amino acids, which makes it the perfect prenatal supplement for growing mosquito eggs, which is only female mosquitoes drink blood. When female mosquitoes aren't drinking blood, they eat nectar just like their Male counterparts.