How reproduction occurs in phylum Echinodermata?

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#1

(a)Sexes are separate with no sexual dimorphism.
(b) Fertilization is generally external.
© Development includes ciliated, bilaterally symmetrical larva, which is usually free swimming and undergoes conspicuous metamorphosis.
(d)A few forms reproduce asexually by division.
(e)Autotomy and regeneration are very common.