Identify the remaining processes and components of the carbon cycle.
plants use co2
fossil fuels form
atmospheric co2
combustion
organisms release co2
1. plants use co2
2. fossil fuels form
3. atmospheric co2
4. combustion
5. organisms release co2

b is the best answer for this question.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.