On a flat surface, the coefficient of friction is a ratio between
and the weight of the object.
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a. the greek symbol li
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b. the force of friction
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c. inertia
d. gravity

On a flat surface, the coefficient of friction is a ratio between

the force of friction and the weight of the object.

Explanation:

The coefficient of friction (COF), is a scalar value without dimensions. It can be described as the ratio of the force of friction between two bodies and the force that presses them together. The force of friction will act against the direction of motion.

The coefficient of friction is highly dependent on the materials that are being used. Near zero to greater than one is range of The coefficient of friction. For those surfaces at rest and relative to each other COF is called as the coefficient of static friction.

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."    

i believe your answer would be c.. : )