This chart shows the metamorphosis of a jellyfish: From stage 1 to 3, it’s a free-swimming larva, called a “planula.” At stage 4, it attaches to a surface and becomes a polyp, growing into what looks like an upside-down jellyfish. At stage 9, the polyp starts to morph, turning into what looks like a stack of disks. By stage 11, the disks are budding off as “ephyra,” essentially juvenile forms of the adult stage. (Image via Wikipedia) Read More