Respuesta :
Direct Combination Reaction : The reaction in which two or more substances combine to form a single substance is called direct combination reaction. Synthesis Reaction: The reaction in which two or more elements combine to form a compound is called direct combination reaction.
HOPED I HELP BRIANEST PLZZ
synthesis is two elements like Al + I. combustion is when it has O2 aka oxygen in the reactants which is the left side of the reactions.