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Question

Palaemon (prawn) has an open circulatory system and has jointed legs. Which group does it belong to?


A

Arthropoda

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B

Annelida

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C

Coelenterata

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D

Protozoa

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Solution

The correct option is D

Arthropoda


Palaemon (prawn) belongs to the phylum Arthropoda. Arthropods are invertebrate animals with an open circulatory system, paired jointed legs and a chitinous exoskeleton.

Annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels.

Coelenterata lacks a specialized circulatory system.

Platyhelminthes phylum do not contain a body cavity nor a circulatory system.


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