GENERAL HISTOLOGY

Detailed explanation-1: -Among the echinoderms, which is a phylum with many regenerating members, crinoids (feather stars and sea lilies) are known to possess high potential of regeneration and are able to regenerate most of their organs.

Detailed explanation-2: -Reproduction in echinoderms is typically by external fertilization; eggs and sperm are freely discharged into the water.

Detailed explanation-3: -Echinoderms are a phylum of marine invertebrates that include starfish, brittle stars, sea cucumbers, sea urchins, sand dollars, and crinoids.

Detailed explanation-4: -The ability to regenerate, or regrow, lost or destroyed parts is well developed in echinoderms, especially sea lilies, starfishes, and brittle stars, all of which can regenerate new arms if existing ones are broken off.