Problem: - Air is taken into the body via the nose or mouth - The air travels into the windpipe - The windpipe divides the air to the two lungs via the bronchial tubes - The lungs oxygenate the blood in the body - Carbon dioxide is filtered out by every cell in the body - The carbon dioxide is carried back to the lungs via the bloodstream What might be the last step of the process?

A: The carbon dioxide is exhaled.

Problem: - As the sweat evaporates the sweat sheds molecules into the air - The sweat changes into a gas - Heat is drawn from the sweat - This process draws heat from the body What might be the last step of the process?

A: The evaporation also cools the remaining sweat on the body.

Problem: - Water from the surface seeps below the soil - The water comes into contact with the rock below - The rock over the years carves through the rock - The space in the rock becomes larger and forms into a cave What might be the last step of the process?

A: As more rather rushes through the cave becomes a cavern.

Problem: - Humans are born as babies - Babies become infants - Infants become children - Children learn skills - Children become teenagers - Teenagers undergo puberty - Teenagers become adults - Adults have children - Adults become elderly What might be the last step of the process?

A:
Elderly humans die.