Which of the following are BOTH processes that return water to the atmosphere in the water cycle ?

The two processes which returned water to the atmosphere in the water cycle are the following.

1) Evaporation: It is a process in which water goes to the atmosphere in the form of vapours from the surface of earth and water bodies such as ocean, lakes and rivers etc. It occurs at all temperatures.

2) Transpiration: It is a process in which water is evaporated in the form of vapours from the surface and inside the body of plants.

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.