Jellyfish

they take a deep breath, exhale really hard and fast so that they get thrusted outside of the water, into the air and when they come back down they are upside down.

The "jelly layer" of jellyfish (and other cnidarians) is called the "mesoglea." The mesoglea is a gelatinous, mostly acellular layer composed of fibrous proteins, such as collagen. The mesoglea often have some muscle fiber bundles and nerves to maintain the mesoglea's form, as well as some amoebocyte cells to consume debris and invading pathogens. The mesoglea serves as an internal skeleton to help the cnidarian retain its form after it relaxes from contracting.

Rotifers fall prey to many animals, such as copepods , moss animals, comb jellies, jellyfish, and starfish, shrimp, crabs, fish fry and fish such as herring and salmon.

false

Body parts radiating from a central axis.
Because you can divide it through in any direction and it would be the same on every side.

No, goldfish are freshwater fish.

Yes it does, you should go to the doctor immediately.

All people with jellyfish stings to the leg or foot will need crutches

The Portuges Man'o'War is a member of the jellyfish family - they reproduce by producing 'polyps' which are in essence microscopic eggs which develop into miniature versions of the adult. These then join the plankton in the ocean, and assuming they're not eaten eventually grow into an adult creature over a number of years.

All jellyfish live in salt water and most do have venom in their tentacles.

The Blue Bottle feeds on small fish and other small ocean creatures. They capture their prey with their tentacles, where a poison is released leaving their prey stunned. The tentacles attach extremely well to their prey. If a tentacle is put under a microscope it looks like a long string of barbed wire, which shows the ability of this jellyfish to kill its prey.

Jellyfish are, compared to mollusks, arthropods and vertebrates, very simple organisms. Jellyfish did not evolve a respiratory or an excretory system, as they can perform gas exchange at their outer surfaces.

Animals with a skeleton of bone are called vertebrates. This category includes fish, amphibians, reptiles, birds, mammals, primates, rodents and marsupials

Jellyfish live in oceans and seas anywhere in the world that it is warm enough for them. There is no one country.

Though the toxins in their nematocysts are effective against their prey, V. velella is harmless to humans, either because its nematocysts are unable to pierce the skin, or perhaps because humans do not react to the toxins encapsulated in their nematocysts. Nevertheless, it is wise to avoid touching one's face or eyes after handling V. velella. Taken from wikipedia.

Non-existent.
jellyfish don't have personalities...

Central pain syndrome is thought to occur either because the transmission of pain signals in the nerve tracts of the spinal cord is faulty, or because the brain isn't processing pain signals properly.

A jellyfish has tentacles which can sting by injecting a toxin. Jellyfish can be extremely dangerous, despite being a very primitive type of organism with no skeletal system.

The stinging cells in a jellyfish are located in it's tentacles.

Poriferans, or sponges, use the flagella of their individual choanocyte cells in order to generate a current of water that brings in food, in the form of zooplankton and or phytoplankton, as well as to bring in oxygen and other dissolved nutrients, and take away carbon dioxide and other dissolved wastes.

the deep sea ecosystem has different animals such as the viperfish, the hatchetfish, the amazing manta ray, the beautiful whale shark, great white sharks, giant squid, megamouth sharks, wolf fish, deep-sea gulper eel, while the shallow water ecosystems of th ocean is filled with amazing coral reefs with animals such as spotted eagle rays, frogfish, eels, porcupine fish, barracuda, squid and octopus

yes

sting

Yes, the head of a jellyfish is called a bell.