The correct answer is A. carbon dioxide gas in the atmosphere.
During photosynthesis, plants take in carbon dioxide (CO2) from the air, which they use to produce glucose and oxygen.
The carbon that plants need for photosynthesis comes from
A.
carbon dioxide gas in the atmosphere.
B.
carbon atoms from the breakdown of food.
C.
carbon molecules dissolved in water.
D.
carbon molecules that the plant produces.
1 answer