The jellyfish is one weird sea animal. What makes it even weirder is that it doesn’t have a brain or a heart. Though it doesn’t have a brain, it does have a nervous system in the form of nerve nets and some have a structure called a nerve ring. This allows the jellyfish to reflexively respond to its surroundings. Some jellyfish like box jellyfish even have structures similar to a human eye that can see in 3-D images located inside the edge of their bell.
The jellyfish also don’t have a heart and neither do they need it. In animals with a heart, the heart functions to distribute oxygen and nutrients throughout the body. For the jellyfish, oxygen simply diffuses from the water into their cells. Similarly with food, the jellyfish has a rudimentary stomach, called the gastroventricular cavity where food is digested and nutrients are directly absorbed into the jellyfish.
*Nature or evolution aren’t conscious decision makers, designing life as they see fit. Evolution is a phenomenon where random genetic mutations create changes in traits over many generations.
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