Final answer:
Biologic use of CO2, such as photosynthesis and weathering, helps to lessen the greenhouse effect and maintain congenial temperatures on Earth. Examples of biologic use include plants absorbing CO2 through photosynthesis and the reaction of CO2 with rocks in weathering processes.
Step-by-step explanation:
The question is asking about the biologic use of CO2 and its impact on the greenhouse effect and Earth's temperature. Carbon dioxide is a greenhouse gas that traps heat in the atmosphere. While the burning of fossil fuels has increased CO2 levels and contributed to climate change, the biologic use of CO2 has actually helped lessen the greenhouse effect and maintain congenial temperatures on Earth by removing CO2 from the atmosphere through processes like photosynthesis.
One example of biologic use of CO2 is photosynthesis, where plants and other photosynthetic organisms absorb CO2 from the atmosphere, convert it into glucose, and release oxygen. During this process, the CO2 is temporarily stored in the plants, reducing its concentration in the atmosphere.
Another example is the reaction of CO2 with rocks in a process called weathering. As the Sun's increased luminosity warms the Earth, rocks weather faster and react with CO2, removing it from the atmosphere over long periods of time. These biologic processes have helped maintain Earth's temperature within a congenial range for the development of complex life-forms.