Which volcanoes had the most number of eruptions? least number of eruptios? no record of eruption​

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

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