Key learning points

1. Unicellular organisms are made of a single living cell.
2. Multicellular organisms are made of more than one cell (sometimes millions), and different cells take on different jobs.
3. In multicellular organisms, cells join together to form tissues with specific jobs.
4. An organ is a group of tissues working together to do a specific job, and organs work together in an organ system.
5. Unicellular organisms have different structures that have adaptations to help them function and stay alive.

Keywords

• Unicellular - A unicellular organism is a living thing that is just one cell.

• Multicellular - Multicellular organisms are made of lots of different types of cells.

• Tissue - A tissue is a group of similar cells in the same place with the same job.

• Organ - An organ is made up of a group of different tissues that work together to carry out a specific job.

• Adaptation - An adaptation is a feature that helps an organism to function and survive.

Common misconception