Which statement describes how electromagnetic waves travel?

what are the statements? x

electromagnetic waves travel through space with vacuums. give me brainliest if right.

i guess it’s a and b

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.