What is the function of a switch in an electrical circuit? A. It interrupts the flow of electrons when it is open.
B. It interrupts the flow of electrons when it is closed.
C. It resists the flow of electrons when it is closed.
D. It resists the flow of electrons when it is open.

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

grav potential energy

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.