Explain what can happen over millions of years to the carbon compounds in organism that die and decompose?

carbon converted to carbonates (bones, limestone). Fossil fuels are stored carbon from plants and animals.

The answer is Autumnal equinox: Date in the fall of the year when Earth experiences 12 hours of daylight and 12 hours of darkness, usually around September 23. Summer solstice: Date on which the Sun is highest in the sky at noon in the Northern Hemisphere, usually around June 22.

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affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

a and c are the answeres