12. Scarlet Jellyfish
Man has been searching in vain for the elixir to eternal life for centuries. Now it looks like the answer might be in the sea. When an adult Scarlet Jellyfish (also known as the eternal jellyfish) is injured, it goes to the bottom of the ocean floor where it morphs back into its infant state, known as a polyp. Then, the polyp becomes a new jellyfish, allowing it to move between an adult and infant state in about 2 months. One jellyfish has been witnessed to perform the cycle 12 times.