Explanation:
I want to help you but your question is not enough because it lacks the datas.
The pollution from the Industrial Revolution darkening the trees. After the trees darkened from all the soot in the air, the white moths were easier to see and more vulnerable to predators. The dark moths blended into the dark tree bark.
The simpliest answer is....the respiratory system gets oxygen and removes carbon dioxide.
---breathing describes the process of inhaling and exhaling air.the exchange of gases( oxygen and carbon dioxide)between living cells and the environment is a process known as respiration...
hope it helps my answer...