Complete the following paragraph to describe the carbon cycle.
a. The element (methane/carbon/carbon monoxide/sources) naturally cycles between the nonliving, or (biotic/fungi/methane/abiotic), reservoirs and living, or (biotic/abiotic/sources/helium), organisms.
b. The major (sources/methane/sediments/methane) that take up carbon are the oceans, fossil fuels, and the atmosphere.
c. There is also a significant amount of carbon present at any one time in (carbon monoxide/helium/carbon dioxide/living organisms)
d. The source of all carbon in living organisms is (fungi/helium/carbon dioxide/carbon monoxide), which cycles from the atmosphere and water into (sources/faster/plants/sediments) and eventually into other living things.
e. Living things release carbon dioxide into the atmosphere through the process of (carbon monoxide/fungi/sediments/cellular respirtation), during the breakdown of organic materials.
f. Plants, protists, and some bacteria remove carbon dioxide from the atmosphere and synthetize organic compounds through the process of (cellular respiration/photosynthesis/sediments/helium)
g. Formation of (fossil fuels/methane/fungi/sediments) and exchange of carbon with the oceans are much (faster/slower/sources/sediments) processes than photosynthesis in removing carbon from the environment.
