We classify groups according to their characteristics.
Animals with backbones are called vertebrates. The 5 vertebrate groups are:
- Fish
They exchange oxygen and carbon dioxide across gills, lay eggs (oviparous) and fertilise externally.
- Amphibians
Exchange gases through moist, permeable skin and lay externally fertilized eggs.
-Reptiles and Birds
Exchange gases via their lungs and lay internally fertilised eggs.
- Mammals
Give birth to live young, which grow inside the body of the mother. Eggs are fertilised internally.
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