ZoologyDuring the course of evolution, a closed circulatory system first appeared in phylum

During the course of evolution, a closed circulatory system first appeared in phylum

  1. A

    Arthropoda

  2. B

    Annelida

  3. C

    Platyhelminthes

  4. D

    Aschelminthes

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    Solution:

    A closed circulatory system is first appeared in phylum Annelida. Circulatory system is absent in Platyhelminthes and Aschelminthes. Arthropods have an open circulatory system.

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