- A butterfly starts as an egg - The egg hatches - A larva emerges - The larva eats and grows - The larva sheds its skin - The larva enters a chrysalis - The pupa grows inside the chrysalis - The adult butterfly exits the chrysalis - The adult butterfly is now fully grown What might be the last step of the process?
Ans: The adult butterfly lays more eggs.

- You breathe in - Diaphragm and other muscles expand to allow room for your lungs to fill - The air flows into the narrow bronchioles in the lungs - From the bronchioles to the alveoli - The oxygen enters into the bloodstream - Is switched with the carbon dioxide in the bloodstream - The carbon dioxide enters through the alveoli - Through the narrow bronchioles - Into the lungs What might be the last step of the process?
Ans: The carbon dioxide is exhaled out of the body.

- Put the aluminum can into a recycle bin - The cans are transported to a facility - The cans are shredded by a machine - The cans are heated to 1400 degrees to melt them - The molten metal is poured into molds What might be the last step of the process?
Ans: The molds are flattened and rolled into sheets to reuse.

- Acid rain enters the atmosphere and lands - Makes water acidic - Kills fish - Kills the soils in trees What might be the last step of the process?
Ans: Leaves are also harmed.