Which of the following is a characteristic of Phylum $Echinodermata$?

  • A
    Dioecious or monoecious,internal fertilization,direct development.
  • B
    Dioecious,external fertilization,indirect development with free-swimming larvae.
  • C
    Dioecious,internal fertilization,direct development with free-swimming larvae.
  • D
    Usually dioecious,external fertilization,free-swimming $Tornaria$ larvae.

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