Cnidarians

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In biology, adaptations are realized through research. Nearly every biological function has been honed through 3.5 billion years of evolution to serve the organism in any particular way. In cnidarians, four main survival adaptations are cnidocytes, endosymbiotic algae, interstitial cells, and the gastroderm.

Cnidocytes are the main distinguishing feature of cnidarians. They are all cells that when activated, fire a projectile at the subject, the projectile remaining attached to the base. Two main types of cnidocytes exist- the nematocyst and the spirocyst.The nematocyst is a harpoon- like cell that when activated, fires a harpoon that injects venom into the subject. The spirocyst does not penetrate the subject, but uses sticky hairs to entangle it.

Endosymbiotic Algae are algae that propagate inside a host. In return for the host serving as a habitat, the host is able to harvest some algae for energy source.

Interstitial cells allow for cnidarians to regrow lost limbs such as tentacles or parts of a lost bell (in jellyfish)

The gastroderm is a stomach- like formation in cnidarians that allows the cnidarian to digest prey, and may include cnidocytes inside to subjugate prey.

They are called pneumatocysts. They are the stinging cells used for killing prey, as all cnidarians are predators. They are cells that contain poison, and have little barbs on them to inject the poison with. With some cnidarians, the little barbs are all that you feel because their poison is only strong enough to kill plankton. With other cnidarians, however, the poison in the pneumatocysts is strong and can be deadly. The main purpose of the pneumatocysts is to kill prey, but they are also useful against predators.

No, polyps are the anchored versions, anemones and hydras and such. The umbrella is called a medusa, or jellyfish.

Yes , Hydra is a Cnidarian animal

If I am correct, they are simple cell organisms, meaning they have no need of sexual reproduction. Instead, they bud, or asexually reproduce.

yes

If you mean the longest-lived, gold corals and black corals can be 2000 to 4000 years old.

"the gravity of the earth cannot explain.that's it. ty

Jellyfish are bell shaped and roundworms aren't. Jellyfish sting and roundworms do not. jellyfish are radial and and roundworms are not.

1

it is called a planula. it is a free-swimmer

A hydra removes undigested food the same ways it takes in food. A hydra takes in it's food through it's tentacles, so it removes food the same way because it's like a pipe stuck in the ground and there is only one way in and one way out.

the hydras and sponges do not have a circulatory system.because, the water in which they live brings all the food and oxygen when it enters their bodies. It also carries away all the waste products and carbon dioxide when it moves out.

They don't sleep!

the larva is called the Planula

by sooting down its prey with a type of poison.