Problem: - Your thermostat senses that the room temperature has fallen below your thermostat setting - Your thermostat sends a signal to your heating system to provide heat for your home - When your oil burner is engaged, heating oil travels from the tank to the burner by way of a pump - Here the oil becomes a fine mist mixed with air - The fuel/air mixture is then injected into the burner where it is ignited in the combustion chamber What might be the last step of the process?

A: The warm air is disbursed through vents, hot water through baseboards, or by steam radiators

Problem: - Coal is heated in the boiler - The water tank over the boiler is heated - Creates steam - The steam is funneled to the piston - Piston uses the steam as energy What might be the last step of the process?

A: The piston causes the crankshaft to move.

Problem: - Ice forms inside a cloud - Ice inside the cloud bumps around and causes electrostatic charges - The cloud becomes a thundercloud - Electrostatic energy builds and forms a strong negative charge - Positive energy is attracted to the negative energy in the cloud - This positive energy gathers on the ground What might be the last step of the process?

A: The positive energy connects with the negative energy and forms lightning.

Problem: - 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?

A:
The adult butterfly lays more eggs.