This extraordinary fact of their Regrowth remains inexplicable, if the belief in reversion to some extremely remote progenitor must be rejected.
"The Descent of Man and Selection in Relation to Sex, Vol. I (1st edition)"
Charles Darwin
That injured multicellular organisms should be able by Regrowth to repair their loss in an analogous phenomenon; thus an earth-worm cut by a spade does not necessarily suffer loss, but the head part grows a tail and the decapitated portion produces a head; sponges, which do not normally propagate by division, may be cut in pieces and bedded out successfully; the arms of a star-fish, torn asunder by a fisherman, will almost always result in several perfect star-fish.
"The Truth About Woman"
C. Gasquoine Hartley