Lesson 1 of 9
More than one sign
Show on a big screenRainwater runs fast down the gutter. A snail sits still beside it. Which is alive?
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Step 1 of 7
- Six signs. Check them all.
- Grows — gets bigger over time.
- Moves — fast, or very slowly.
- Needs food and air, again and again.
- Gets rid of waste.
- Responds to what happens around it.
- Makes more of its own kind.
The six signs
The snail is alive, even though the water moves faster. It grows, eats and breathes.
| Sign | In a few words |
|---|---|
| Grows | Gets bigger over time |
| Moves | Fast, or very slowly |
| Food and air | Taken in again and again |
| Waste | Lets go of what it does not need |
| Responds | Reacts to what happens nearby |
| Makes more | Starts a new living thing |
One sign alone cannot prove life. Water moves fast. A toy frog hops. Neither the water nor the toy grows or eats.
Try the lab to finish this lesson.