Forensic entomologists study what to solve crimes?

Flies

Explanation:

Forensic entomology uses the study of insects to help criminal investigations. Forensic entomologists often help determine the time of death, especially when the circumstances of death are unknown. They do this using insect evidence. For example: when decomposition begins, blowflies infest a body, laying eggs that eventually hatch into fly larvae (maggots).

tissue

explanation:

it is actually formed by geoup of cells which is tissue

the real answer is b. scintillation counter