Give a general description of the type Arthropods and name the classes included in this type.

1) Arthropods are bilaterally symmetrical animals.
2) The body of arthropods is segmented into sections (head, chest, abdomen or cephalothorax and abdomen) and is equipped with articulated limbs.
3) All arthropods have a chitinous cover that acts as an external skeleton.
4) The type includes classes – Crustaceans, Arachnids and Insects.
5) Classes differ from each other in structure, number of limbs, developmental features, habitat.

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