In the water cycle, which step shows how water moves from the biosphere to the atmosphere? a. the air we breathe out contains carbon dioxide and water vapor. b. groundwater from the soil passes through a plant's roots, stem, and leaves. c. water vapor in the atmosphere accumulates, resulting in thick gray clouds. d. water evaporates into the atmosphere from the surface of a warming lake.

Ans.  

Water cycle describes a cyclic process that involves circulation of water between the earth's atmosphere, oceans, and land through precipitation, drainage in rivers and streams, and return to the earth's atmosphere by transpiration and evaporation.  

During respiration, organisms exhale carbon dioxide and water in the form of vapor that goes back to the atmosphere by evaporation.

Thus, the correct answer is option A).  

 A. The air we breathe out contains carbon dioxide and water vapor.

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.