A thin covering around all cells that controls what goes in and out.

The ability to keep a stable, balanced internal environment.

Scientist who built simple microscopes and saw tiny living organisms in water.

Made of only one cell.

An old, disproven idea that living things can come from nonliving things.

Connects the eyepiece to the nosepiece.

Controls how much light passes through the slide.

The “control center” of the cell that holds DNA.

The lens that makes the image the largest (strongest magnification).

The jellylike material that fills the cell and holds organelles in place.

A complete living thing.

The flat platform where you place the slide.

An organism that must eat other living things for food (like animals).

Reflects light upward through the slide (on some microscopes).

A small round structure inside the nucleus that makes ribosomes.

The part you look through to see the specimen.

Something in the environment that causes a change or reaction.

A body part made of different tissues working together.

Made of many cells.