I believe this is the answer you are looking for:
<span>C. The size and shape of their beaks</span>
Answer:
Your answer for this is D
Hydrogen would be the answer to this.
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During photosynthesis, plants absorb carbon dioxide and sunlight to create fuel—glucose and other sugars—for building plant structures. This process forms the foundation of the fast (biological) carbon cycle. ... In all four processes, the carbon dioxide released in the reaction usually ends up in the atmosphere.