People and animals breathe in oxygen from the air and exhale carbon dioxide.
what happens to the carbon dioxide in the air?
a. some animals breathe in carbon dioxide and exhale oxygen.
b. the carbon dioxide floats into the atmosphere and forms clouds.
c. plants use carbon dioxide to make sugars and oxygen.

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

Resperation is a way to release carbon back into the atmosphere

Which step is not included in the step approach to calculating the greatest common divisor?