A reaction involves burning. this reaction requires energy to start, but it releases more energy then is required to start it . Oxygen is always a reactant , and the products are usually carbon dioxide and water.

*combustion
*decomposition
*replacement
*synthesis

A __combustion reaction involves burning. this reaction requires energy to start, but it releases more energy then is required to start it . Oxygen is always a reactant , and the products are usually carbon dioxide and water.

Explanation:

Combustion reactions are exothermic type .; where a substance or mixture of them called fuel interacts with oxygen. The formation of a flame occurs, which limits light and heat.

An example of a combustion reaction is as follows:

CH4 (methane) + 202 ---> C02 + 2 H20

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.

the answer is 75.0%.