Which observation would be best evidence of carbon cycling? a.) water droplets b.)moving animals c.)plant growth d.) dead plants

C.)plant growth

Explanation:

The carbon cycling is a process in which the carbon and it's various organic forms are transformed and delivered to various earth spheres such as biosphere, geospheres, hydrospheres, pedospheres and atmosphere. Carbon is the basic element found in all life forms. The cycling of carbon can best be observed in the plant growth. This is because of the fact that carbon is obtained by the plants in the form of carbon dioxide which is a chief ingredient required for the process of photosynthesis. Photosynthesis is necessary for the plants to produce food in the form of carbohydrates required for the growth and metabolism in plants.

pure substance: iron,copper

impure substance: water,charcoal

if you mean hydrogen and oxygen then water is the product