1. Carbon Cycle -Living things depend on nonliving things for life
-At the organism level, living things depend on natural resources, and at the molecular level, they depend on chemical cycles

2. Carbon Cycle
-Carbon and other elements are recycled back and forth between organisms and their environments
-carbon, among other elements, is necessary for life as it is the one of the main raw materials for organic matter

3. Carbon Cycle
-the recycling of carbon occurs through respiration (exhaling of CO2), the excretion of waste products, and the death of organisms
-sources of carbon include:
-combustion -death/decomposition
-volcanoes
-life; respiration (CO2)
-places where carbon gets taken in:
-plants
-ocean
-air