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| style="height:20px; width:200px; text-align:center;" | A puffin lays hard eggs and has feathers.
| style="height:20px; width:200px; text-align:center;" | An axolotl lays soft eggs, has gills and lungs and no scales.
| style="height:20px; width:200px; text-align:center;" | A hedgehog does not lay eggs and has fur.
| style="height:20px; width:200px; text-align:center;" | A gecco lays soft shelled eggs and has dry scales.
|[[File:ClassificationKey2.png|center|400px]]
|}
==Key Stage 3==
===Meaning===
A '''classification key''' is a set of questions about the features of a [[Alive|living thing]] that can be used to [[identify]] it.
==Key Stage 4==
===Meaning===
A '''classification key''' is a set of questions about the features of an [[organism]] that can be used to [[identify]] it.