Small neutral changes in nucleic acids which accumulate at a fairly constant rate can be used as a _ (blank) _ to determine when two species diverged from a common ancestor.

During the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

What organ systems are working to you cool down after a workout?

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