Q. 5. Which statement best explains why the carbon cycle is classified as a closed-loop system?
answer choices
A. Carbon levels are monitored and maintained by
plants in a system.
B. The flow of carbon occurs only in nonliving
components of a system.
C. Earth's atmosphere traps all carbon once it
passes through living organisms in a system.
D. A fixed amount of carbon flows between the
living and nonliving components of a system.

C. Earth's atmosphere traps all carbon once it

passes through living organisms in a system.

b

is correct hope this   also i learnd this in middle school

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: