Tiny organisms that are made of a single cell.

When something becomes different over time

The moment when two objects hit each other

The ability to make things move or change

A balanced state in which a system is stable, such as when two or more samples are at the same temperature

Water that is underground

To reach a conclusion using evidence and reasoning

The energy that an object has because it is moving

Anything that has mass and takes up space

A group of atoms joined together in a particular way

To make something safe to eat or drink by heating it

A small part that is meant to show what the whole is like

When something stays mostly the same over time

A set of interacting parts forming a complex whole

A measure of how hot or cold something is

To move from one object to another or one place to another

A heating unit that stores and warms water