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Enzymes speed up reactions by decreasing how much ____ a reaction needs to start . (______)

Protein function under specific conditions such as a small range of _______ and _____.


The Miller-Uray experiment showed us the small organic molecules can for from _____ molecules.

One of the most important characteristics shared by all the experiments is that there was limited _____ present.

Organic molecules have been found on _____ and _____ which confirm the lack of oxygen which confirm the lack of oxygen required.