Jellyfish

Short answer: both but it's a bit more complicated than that. There are several stages of jellyfish reproduction. They first release sperm and eggs into the water in a sexual medusa stage. Once fertilized, the eggs become planula larvae which settle onto a substrate and grow into a polyp stage. This stage resembles a sea anemone. It is only during this stage that asexual reproduction occurs. The polyp now has two options: The first being reproduction by budding, in which case more polyps are created. The second is called strobilization, which is where the polyps elongate and buds to create a strand of disks stacked upon one another. Each disk then detaches from the polyp, and is now called an ephyra. This ephyra is what grows into an adult jellyfish, and the cycle repeats.

Economically they do not have much economical importance to humans directly. They do, however, prey on small fish and crustaceans so it can affect us indirectly. Contrasting, they help the economy by providing a beautiful sight to look at when scuba diving.

They don`t half sting though!

Jellyfish lifespans typically range from a few hours (in the case of some very small hydromedusae) to several months. Life generally ends after the medusa has begun spawning. Life span varies by species. Most large coastal jellyfish live 2 to 6 months.

in dinasour times there were things with tenacles people have only found one and on the discovery channel they proved the answer they don't know exactly how they were made but this is there only guess

Almost all jellyfish are free-living predators. A few species, such as the upside-down jellyfish and other members of the jellyfish order, Rhizostomeae,have no mouths, and, instead, cultivate symbiotic algae for nourishment.

IDK.Box jellyfish, Portuguese Man o war, Sea nettle, Earacounge (Ear-a-con-g). IDK the rest

Nothing called a "Jellyfish" is either mammalian of amphipian, in that they dont breath with lungs, nor do they live out of water. Most of the animals called "Jellyfish" are from one of these phyla: * Box Jellies -- poisonous -- Cnidaria * Comb Jellies -- Ctenophora * Portoguese Man Of War -- Cnidaria, hydrozoa* Jellyfish -- Cnidaria In the old days, these two were grouped under one, now obsolete, Phylum: Coelenerata

Yes; however many of them are not poisonous for primates, but inoculate allergens, which can kill by anaphylactic shock.
Yes, if I'm not wrong......
some are

Oddly enough, yes. An interesting side note: When turtles eat a lot of jellyfish, they give off a pheromone that makes sharks frenzy in their presence. Often, the turtles are the main course of the frenzy. Talk about food chain cruelty.

A jellyfish, largely known now to science as a jelly since it is not a fish, is formed of a bell portion followed by long oral arms, or tentacles. The bell is formed mostly of water and a jelly-like substance called mesoglea.

they sleep in the morning and are awake at night.

Yes, they die like most living things when they are badly hurt.

The water itself is supporting the jellyfish itself and assists in movement. You might notice that jellyfish fall flat and die when on land.

If your asking what they eat, its usually small/dead plants that are floating around.

females are small and males are big.

EDIT: Jellyfish are both male and female (uni-sexual, hermaphrodite or homosexual), meaning they each have the ability to release both sperm and eggs into the water for fertilization and reproduction. It has absolutely nothing to do with their size.

Sea turtles eat box jellyfish; they are unaffected by the deadly sting.

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There are several different poisonous jellyfish. They belong to the box jellyfish species. Some of the most popular are the Chironex Fleckeri, Irukandji, Fire Jelly, and the Morton Bay Stinger.

Although the true depth of an ANGLERFISH is unknown, they live SO deep that almost no light can reach them. They use their "lights" to lure fish into their doom. ( mouth ) FUN FACT: Female Anglerfish are 5 times bigger than a male. In comparison, it's like you, compared to an elephant!

Actually, Wikipedia DOES know! Some are pelagic, others are benthic: Please see the related link below for more information:

There are two ways in which jellyfish move through the water. Some swim, using jet propulsion, and some attach themselves by a stalk to other material, such as seaweed. Both types are referred to as zooplankton (animal drifters), because their movement is strongly influenced by the ocean's current. Even jellyfish capable of jet propulsion are not strong enough swimmers to counter the power of the current and waves.

Jet propulsion in jellyfish is possible because of special muscles called coronal muscles, embedded on the underside of the bell, which push water out of the hollow bell. As water is pushed in one direction, the jellyfish moves in the opposite direction.

Without a brain or eyes, jellyfish rely on nerve cells to help them move and react to food or danger. Sensing organs tell them whether they are heading up or down, into the light or away from it.

Pee on it. Peeing on a stung bit of skin won't do much to relieve suffering, and you'll suffer some odd stares, too, doctors say. Urine has not been scientifically proven to help in jellyfish stings, said Dr. Paul Auerbach, an emergency physician at Stanford University Hospital and an expert on jellyfish stings. Instead, vinegar is the best first treatment, he said, when treating stings from North American jellyfish.

They are alkali, hence the use of vinegar to neutralize the stings.

Theoretically, the protagonist is wracked with guilt and wants to die quickly and painfully. If the movie had any basis in reality, this action would be counterproductive. Will Smith's character wants to commit suicide to donate his organs to worthy people, but Box jellyfish poison is a neurotoxin, and it is distributed to every part of the body, making Ben's organs unfit for transplant.

Jellyfish have a very simple body type and are invertebrates. Their bodies include only a stomach chamber and several layers of skin that form a membrane along with a nerve net.