The carpenter to produce carbohydrates in the second stage of photosynthesis comes from

The carbon to produce carbohydrates in second stage of photosynthesis comes from CARBONDIOXIDE.

Explanation:

Photosynthesis is the process by which green plants use light energy from sunlight with carbon dioxide and water to produce glucose.

This involve two stages; the light dependent and light independent stage(dark stage).

The light independent is the second stage and it uses carbon atoms from carbondioxide , which gas exhaled by animals to produce carbohydrates. It is also referred to as Calvin cycle because it used energy stored by the light dependent stage to form carbohydrates.

allowed for the prediction of the properties of missing elements.

the actual answer was 160934