If you consider the combined processes of photosynthesis and cellular respiration, the electrons found in H 2O at the beginning of the light reactions end up attaching to during respiration.

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Explanation:

The electrons start their journey through metabolism in and end in the that is made.   serves as the final electron acceptor in oxidative phosphorylation, so as to combine with protons to make new "metabolic" water.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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pls mark as brainliest

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.