Why is the circulatory system of an earthworm called a closed type of circulatory system?

  • A
    Because blood flows through open spaces.
  • B
    Because blood is confined to blood vessels and capillaries.
  • C
    Because it lacks a heart.
  • D
    Because it has an open body cavity.

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$(ii)$ The excretory organs of earthworms are nephridia.

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$(i)$ Cocoon
$(ii)$ Worm casting

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