Which is a reactant in the Calvin cycle?
O
O
A. Glucose
B. Oxygen
O
O
C. Water
D. Carbon dioxide

D.Carbon Dioxide

Explanation:

The light reactions use the reactant water from the equation and release the product oxygen. The Calvin cycle, which takes place in the stroma, uses ATP and NADPH to convert carbon dioxide to sugar.

Hope this helps you!

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.