A triceratops, a prehistoric organism with three horns, has died by the side of the river. This is the [ Select ]
to the creation of a fossil. Next, as the organism decays, the soil around it
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the organism because of the natural movement of sediment. The soil
[ ? ]
into rock due to the temperature and pressure. Last, the rock
[ ? ]
away so that the fossil is exposed for scientists to find.

answer: cellular respiration takes in food and uses it to create atp, a chemical which the cell uses for energy. usually, this process uses oxygen, and is called aerobic respiration. it has four stages known as glycolysis, link reaction, the krebs cycle, and the electron transport chain.

the enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.