lesson
A group needs a reason
1 · Learn
Scientists classify organisms using shared characteristics. A useful grouping explains which features its members share and which features distinguish other groups. Where an animal lives alone is not enough: whales and fish both live in water but differ in important body features.
Start with observable evidence, then check features you cannot see in a photograph using a reliable reference. Do not invent an unseen feature just to make an organism fit your first guess.
2 · Worked example
A whale breathes with lungs and feeds its young milk. Those features support classifying it as a mammal, even though its body is adapted to swimming.
3 · Your turn
Why is 'lives in water' insufficient to decide that an animal is a fish?
Check your answer
Different groups live in water. Use relevant characteristics, such as how it breathes and reproduces, rather than habitat alone.
4 · Apply your learning
Compare adult-selected fact cards for a whale, salmon and frog. Record a grouping and the evidence for it.
Adult guidance and safety
Provide verified species cards with complete information. Do not handle unknown wildlife.
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