Cells
Classify Organisms
Organisms of the Past
Organisms and Where They Live
Changes in Ecosystems
100

Smallest unit of all living things.

What are cells?

100

A characteristic of a living thing.

What is a trait?

100

Any evidence of an organism that lived in the past.

What is a fossil?

100

The interactions of living and nonliving things in their environment.

What is an ecosystem?

100

Long period of time with little or no precipitation.

What is drought?

200

Cells that work together.

What is tissue?

200

The largest group into which an organism is classified.

What is a kingdom?

200

When an organism is no longer alive on Earth.

What is extinct?

200

An organism's home.

What is a habitat?

200

This is when harmful substances are added to Earth's water, air, or land.

What is pollution?

300

A group of tissues that work together.

What is an organ?

300

Smallest group into which an organism is classified.

What is a species?

300

An undeveloped animal or plant.

What is an embryo?

300

One type of organism.

What is a population?

300

When an ecosystem has too many of at least one kind of living thing.

What is overpopulation?

400

Protects and supports the cell.

What is the cell wall?

400

The set of steps in which organisms get food.

What is a food chain?

400

The living part of an ecosystem.

What is a community?

400

The burning of coal, gasoline, and other fuels causes.

What is acid rain?

500

Plant cells have this, but not animal cells.

What is chloroplast and cell wall?

500

An organism that eats a producer.

What is a consumer?

500

An organism, such as a plant, makes food?

What is a producer?