Insects have a different type of immune system than vertebrates. an insect's fat body is an organ that functions like the human liver. when an insect faces infection, its fat body and some blood cells produce proteins that cooperatively attack harmful bacteria and viruses. an insect's immune system it to maintain homeostasis by a destroying foreign organisms and genetic material. b expelling foreign organisms and genetic material. c concentrating foreign organisms and inorganic material. d transforming foreign organisms and inorganic material.

The correct answer is- A)

Insects are dependent on innate immune system for their survival. It is broadly divided into two categories that is cellular and systemic immune response.

When an insect faces infection, its fat body ( that is liver) and some blood cells produce proteins, which attack the infectious agents. These proteins are called antimicrobial peptides ( AMP) that are secreted into the hemolymph, where they fight against the infection by destroying foreign organisms and genetic material.

Due to this, a homeostasis ( a state of equilibrium) is maintained in their body.

Thus, option A) is the right answer.