• Large animals are made of trillions of cells

• Bacteria are made of just one cell

​Examples

A living thing can consist of trillions of cells, or just one.

​Unicellular or Multicellular

1. Made of cells

• One bacterium splits itself in two new cells

• Birds lay eggs to produce offspring

​Examples

Asexual reproduction requires only one parent organism. Sexual reproduction requires 2 parent organisms. Some organisms can reproduce sexually and asexually.

​Asexual or Sexual Reproduction

2. Reproduction

• A tree grows taller, and bears and sheds leaves.

• A caterpillar changes to a butterfly.

​Examples

As organisms age, they increase in size, and go through various stages of change to reach maturity.

​Organisms change over time.

3. Growth and Development

• Grass makes its own food with water, sunlight, and carbon dioxide.

• Cows eat grasses and other vegetation.

​Examples

Autotrophs are organisms that can make their own food. Heterotrophs are organisms that consume other organisms for food.

​Autotrophs and Heterotrophs

4. Obtain and Use Energy

• A Venus fly trap closes when an insect touches its hairs.

• A cat jumps at a sudden loud noise.

​Examples

Stimuli are things that occur in an organisms internal or external environment that cause it to react. One stimuli is called a stimulus.

​What does 'stimuli' mean?

5. Response to Stimuli