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One Cell and Many Cells
Age 12 · Biology
A single-celled organism is a whole living thing made of just one cell, like the oval microbe. A multicellular organism, such as a dog or a human, is built from many cells that work together.
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In the picture
- A lone oval microbe floating in fluid: a whole living thing made of one cell.
- The darker round dot inside the microbe: its nucleus, the control centre of the cell.
- The animal’s outline: the body of an organism built from many cells.
- One oval cell inside the body: a single unit among many packed closely together.
Examples
- An amoeba, a whole organism in one cell.
- A dog, built from billions of cells.
Key takeaways
- Some living things are made of only one cell.
- In multicellular organisms, many cells work together.
Quiz: One Cell and Many Cells (Age 12)
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What is a single-celled organism?
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In multicellular organisms, what do many cells do?
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Which of these is an example of a multicellular organism?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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