Question 4
How does carbon dioxide enter the atmosphere?
a
Carbon dioxide is only released into the atmosphere by human activities.
b
Carbon dioxide is only released into the atmosphere by animals and bacterial decomposers.
c
Carbon dioxide is only released into the atmosphere by plants, animals, and bacterial decomposers.
d
Carbon dioxide is released into the atmosphere by plants, animals, bacterial decomposers, and human activities.
d
Carbon dioxide is released into the atmosphere by plants through respiration and by animals through respiration and other metabolic processes. Bacterial decomposers also release carbon dioxide during the decomposition of organic matter. Additionally, human activities such as the burning of fossil fuels and deforestation are major sources of carbon dioxide emissions.