Science · Stage 3
Investigate: Backbone or No Backbone?
Feel the bumpy line down your back — then test which animals have a backbone, the fair way!
✦ Science📘 Stage 3 · S3⏱ ~10 min🧒 Ages 7–8★ Free to start
I can predict, then change one thing and keep the rest the same to make my test fair.
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Kavi Feels Its Backbone
Kavi runs a wing down the middle of its back 🧍. "I can feel a bumpy line — that's my backbone!" Kavi grins. "A 🐟 fish has one too, but a 🐌 snail is all soft inside. Let's test animals for a backbone — and run a fair test by changing just one thing at a time."
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What your child will learn
1Backbone or no backbone?Animals split into two big groups — ones with a bony spine, and ones without. Tap each to learn it.
2Does it have a backbone?Be the scientist! Tap the right box for each animal.
3How to run a fair testA fair test only changes ONE thing. Follow Kavi's steps — tap each one!
4Make it a fair testGuess first, then tap to check. Tap Next test → for more!
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A peek inside
Kavi looks at a 🐟 fish. Run a finger along its body — there is a bony spine down its back. Does it have a backbone?
A bony spine down the back means it is a backbone animal.
Try this at home: Name an animal that has a backbone.
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 3 · S3 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.