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Why don't jellyfish and flatworms require a heart?

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heart-blood-gill. Flatworms, nematodes, and cnidarians (jellyfish, sea anemones, and corals) do not have a circulatory system and thus do not have blood. ... on the outside of their body come into contact with water, oxygen and nutrients can diffuse into their body to provide them with everything they need. read more

Jellyfish do not have brains. They don’t have a heart either. But jellyfish do have a very basic set of nerves at the base of their tentacles. These nerves detect touch, temperature, salinity etc. read more

Penis fencing is a mating behavior engaged in by certain species of flatworm, such as Pseudobiceros hancockanus. Species which engage in the practice are hermaphroditic, possessing both eggs and sperm-producing testes. The flatworms "fence" using two-headed dagger-like penises which are pointed, and white in color. read more

If the tentacle is still attached, you will want to remove it, but don’t do so with your hands. To do this, you’ll require some kind of barrier between the tentacle and the person doing the removal. The most important point is to minimize the contact between the tentacle and the patient’s skin, to avoid any further stings. read more

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