Question

Which of the following two cycles are the most closely related in their role in sustaining life?
a.
carbon and nitrogen
b.
water and nitrogen
c.
carbon and oxygen
d.
nitrogen and phosphorus


Please select the best answer from the choices provided

A
B
C
D

Answer 1

C

The carbon and oxygen cycles are tightly linked by photosynthesis and respiration: plants use CO2 and release O2, while animals and microbes use O2 and release CO2, sustaining aerobic life.