Why do we use diagrams to explain the carbon cycle

When new life is formed, carbon forms key molecules like protein and DNA. It's also found in our atmosphere in the form of carbon dioxide or CO2. The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again.

Explanation:

1.the evidene of the reaction

2.yes

3.yes

answer; ///(b) it is composed of four protein chains and four heme groups;