The Nature of Science
An exploded star
What is a supernova?
Atoms to molecules to cells to tissues to organs to organ systems to this.
What are organisms?
This is when a scientist repeats his own experiment.
What is repetition?
This is the solid outer part of the Earth
What is the crust?
This is what glaciers are made of
What is the ice?
This is not a controlled experiment, but is used when scientists study organisms in their natural surroundings.
What is an observational?