Arthropods
Insects, spiders and scorpions, crustaceans and millipedes all have jointed legs and a hard outer skin, so together they make one big group: the arthropods. That hard skin can't grow, so an arthropod sheds it from time to time and grows a bigger one. This is called moulting. Arthropods are by far the largest group of animals.
Depth 1 · Foundation
You can say what all arthropods share, name their groups and explain why they moult.
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Foundation
You can say what all arthropods share, name their groups and explain why they moult.
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