if the control is solid and an uninoculated tube is solid, is it acceptable to read the result before the complete incubation time has elapsed?

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist