Which of the following is responsible for making nitrogen in the atmoshpere usable by living organisms?
a) absorption of nitrogen rain
b) conversion of nitrogen into carbohydrates by photosynthesis
c) nitrogen-fixing bacteria
d) decomposing bacteria

A

Explanation:

It is absorption of nitrogen by rain. Thunderstorms and lightning convert atmospheric gaseous nitrogen to oxides of nitrogen. These oxides dissolve in water and form nitrous acid and nitric acid. The acid in turn combine with other salt to form "nitrates".

Note: Organisms cannot pickup gaseous nitrogen directly from atmosphere. It has to be converted into nitrates to be utilised.

the match duh

explanation:

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."