He cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in.

carbon dioxide is taken in by plants during photosynthesis. the cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in. the animal releases the carbon dioxide back into the atmosphere during respiration. the animal eats a plant and uses its carbohydrates for energy

the answer would be b.:

880,000.

hope it ,

bioteacher101

the correct answer is:

they show how organic molecules could be made from earth's early atmosphere.  

explanation:

the miller–urey experiment lasted a chemical experiment that mimicked the forms created at the time to be present on the early earth and tested the chemical element of life under those circumstances. the experiment confirmed alexander oparin's and j. b. s.