Which statement best describes the germ theory of disease?
diseases are caused by bad-smelling poisonous vapors that contain decaying matter.
diseases are created or generated spontaneously within the body.
diseases can be isolated and grown in cultures.
diseases are caused by the presence and action of specific microorganisms.
answer is d

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The statement best describes the germ theory of disease is Diseases are caused by the presence and action of specific microorganisms.

The correct answer is D. Diseases are caused by the presence and action of specific microorganisms.

Explanation:

Carbon cycle is the process where carbon compounds are interchanged among the biosphere, geosphere, pedosphere, hydrosphere, and atmosphere of the earth.

1) Carbon present in the atmosphere is absorbed by plants for photosynthesis.  

2) These plants are then consumed by animals and carbon gets bioaccumulated into their bodies.

3) These animals and plants eventually die, and upon decomposing, carbon is released back into the atmosphere.

4) Some of the carbon that is not released back into the atmosphere eventually become fossil fuels.  

5)These fossil fuels are then used for man-made activities, which pumps more carbon back into the atmosphere.

Carbon in the atmosphere is present in the form of carbon dioxide. Carbon enters the atmosphere through natural processes such as respiration and industrial applications such as burning fossil fuels.