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Jellyfish are approximately 95-98% water and have no eyes, ears, mouth, heart or a brain and have no bones/spine making them invertebrates. They do not require a heart or lungs because their skin is so thin oxygen can pass easily through into their body. This is known as diffusion. They also do not need a brain and eyes as they have a set of ...
Jellyfish reproduce and move into new niches so rapidly that even within 40 years, some experts predict “regime shifts” in which jellyfish assume dominance in one marine ecosystem after another.
The Lion’s mane jellyfish, Cyanea capillata, is the largest known jellyfish. They’re found in the Arctic, North Pacific and North Atlantic oceans. They’re often seen in waters around the UK and Ireland. The lion's mane jellyfish's tentacles can reach over 30 metres in length – that’s longer than a blue whale.
An adult jellyfish is a medusa (plural: medusae ), named after Medusa, the mythological creature with snakes for hair who could turn humans to stone with a glance. After the male releases its sperm through its orifice into the water, the sperm swim into the female's orifice and fertilize the eggs.
29 de sept. de 2009 · No brains, heart, or eyes: These fish are mostly made up of water. They have no brains, hearts, or eyes. They also have no bones, and their body is primarily controlled by the nervous system. Ancient, prehistoric beings: Jellyfish are known to have been around for millions of years – even before dinosaurs!
Jellyfish Lifecycle and Reproduction. (Smithsonian Ocean Portal) Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually. Learn more about the lifecycle and reproduction of jellyfish.
