Question

Ken wrote a few steps to describe how carbon circulates between the atmosphere and living organisms.

Step 1 is missing.
Step 2: Plants use carbon dioxide to make glucose
Step 3: Plant-eating animals consume the glucose present in plants
Step 4: Animals exhale carbon dioxide
Which of the following best describes step 1?
A.Carbon enters the atmosphere as carbon dioxide from respiration and combustion.
B.Dead animals are buried and form fossil fuels, which produce glucose on combustion.
C.Dead animals decompose and recycle the carbon in the form of oxygen and water vapor.
D.Carbon dioxide in the atmosphere is converted into glucose by animals during respiration.

Answer 1

The correct answer is A: Carbon enters the atmosphere as carbon dioxide from respiration and combustion.

Answer 2

A). Carbon enters the atmosphere as carbon dioxide from respiration and combustion.