The quantum theory of energy levels within atoms was alded by:
study of the sun's light spectrum
o emission line spectra of various elements
alpha particles
o gamma rays

Explanation:

The quantum theory of energy levels within atoms was aided by the emission spectrum. When excited with light, different elements emitted photons of different frequencies. The frequencies were different because the energy difference from excited to low energy state was different depending on the element.

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i think that d. wind is the answer.   i missed the question when i answered a. currents.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.