Texts: Circle all of the true statements
A. Aquatic producers take up dissolved carbon in the water, and terrestrial producers take in carbon from the air, and both make it available to consumers by converting it to organic carbon.
B. Consumers, scavengers, and detritivores return carbon to the atmosphere through respiration.
C. Human activities have brought carbon pools from the deep lithosphere to the Earth's surface and returned them to the atmosphere through the combustion of fossil fuels, leading to rapid climate change.
D. CO2 enters the ocean when it is used by producers for photosynthesis, but the ocean can also absorb CO2 directly.