What is the source of carbon that is made into carbohydrates by primary producers?

What is the source of carbon that is made into carbohydrates by primary producers?

What is the source of carbon that is made into carbohydrates by primary producers?



a. Carbon dioxide gas
b. Hydrocarbons
c. Calcium carbonate rocks
d. Water
e. Calcium carbonate in oceanic organisms






Answer: A


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