Question

Living things need energy to carry out their life processes. Animals get this energy from food through a process called cellular
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. The first stage, glycolysis, occurs in
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conditions, or without oxygen. The second stage, called the Krebs cycle, and the third stage, electron transport, require the presence of oxygen, and are therefore
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.

Answer 1

Answer:

Organisms mainly use two types of molecules for chemical energy: glucose and ATP. Both molecules are used as fuels throughout the living world. Both molecules are also key players in the process of photosynthesis.

Explanation: