Answer:
A) transpiration from soil and from plants returns approximately 21 of the 30 inches to the atmosphere, while the balance of 9 inches contributes to the flow .
Step-by-step explanation:
Transpiration in this context is the process by which plants lose water in the form of vapor. This process is very important in nature because it helps plants perform in an appropriate way their photosynthesis by transporting disolved nutrients into the plant cells. Another aspect that is also important is that transpiration helps plants to have an adequate temperature, just similar to the sweating process in human beings.