Nthe body cells of most organisms, oxygen is used to release for use by the cells. a) urea b) sugar c) energy d) carbon dioxide

C

Explanation:

Oxygen is used the ultimate proton acceptor in the mitochondria of cells. During the Krebs cycle, the H+ ions produces from oxidation of FADH2 and NADH are pumped to the inter-membrane space. The proton motive force generated is used to make ATPs and ultimately reduce oxygen to water.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.