Question

insects have blood which​

Answer 1

The reason insect blood is usually yellowish or greenish (not red) is that insects do not have red blood cells. Unlike blood, haemolymph does not flow through blood vessels like veins, arteries and capillaries. Instead it fills the insect's main body cavity and is pushed around by its heart...

Answer 2

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Insects do have blood -- sort of. It's usually called hemolymph (or haemolymph) and is sharply distinguished from human blood and the blood of most animals that you would be likely to have seen by an absence of red blood cells