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Q.

What are the chief characters of crustaceans

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Detailed Solution

* They are aquatic arthropods.
* Head and thorax fuse to form cephalothorax
* In some exoskeleton hardened by calcium carbonate.
* Respiratory organs are gills.
* Excretory organs are green glands or antennary glands.
* Sensory organs are antennae, compound eyes, etc. Eg: Palaemon (Fresh water prawn)
Cancer (Crab)

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