Jellyfish were created by God on the 5th day of creation. Most jellies live near the surface of the ocean but some do live in the deep. They live in all oceans and some salt water lakes. Jellyfish can live near reefs or out in the middle of the ocean, depending on the species. Most jellies live in the warm tropical regions, but there are many that don’t.
The size of their bell (or body) ranges from the size of a dime to a beach umbrella and their tentacles can be from 1 inch to 100 feet long. God created some to be transparent and some that live in the deep are bioluminescent, which means they glow in the dark. Oddly, jellyfish have no brain, rather, it is their nerves that enable them to function and catch food.
Jellyfish are invertebrates, so they have no bones. Their body is called a bell and their eyes circle the bottom of the bell. They have very poor eyesight, as they can only tell teh difference between light and dark. Their mouth is on the underside of the bell, as in an octopus. Oral lobes hang down from around the mouth and the tentacles hang from the edge of the bell.
Jellyfish are predators and though all are poisonous, some can be deadly to humans. Oftentimes jellyfish will remain still in the water and let their tentacles hang down through the water. When an fish swims through the tentacles, the stinging cells that the jellies tentacles are covered in open and darts that are too small to be seen shoot out and hold the prey so the jellyfish can inject the poison into its prey. The poison weakens the prey and sometimes even kills it. Some fish are immune to the poison and can prey on the jellyfish.
The jellyfish life cycle is very odd. The female releases her eggs into the water and they are on their own. After about a week the eggs become planulas, which, in their shape, they somewhat resemble giant snowflakes. The planulas sink to the bottom of the ocean and then become a polyp. The polyp anchor themselves to rocks and remain there for about a year. During that time tiny disks begin to grow off the polyp. the disks take about a year to develop and then they are released into the water. After several days, the disks develop into medusae (adult jellyfish).