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They are a special type of ectotherm called a poikilotherm meaning they have the same body temperature as their ambient surroundings.
A hydranth (feeding polyp) will have a hypostome, mouth and tentacles. A gonangium (reproductive polyp) will have medusa buds and gonotheca. The medusa buds will become free swimming Medusa to sexually reproduce by the female releasing an egg and the male releasing haploid sperm. After fertilization, the zygote develops into a ciliated, swimming planula larva which will settle to the ocean floor attaching itself to the substrate. A new generation of polyps then begins to form through asexual budding.
It has a single layer of cell.
Lay a paper on a flat surface. With your hands on the surface, push two sides together until you make something that looks like a polyp. Voila! Something similar to a crosssection of a sponge. Think of the paper as cells in a single line.
Cnidarians and sponges receive most of their food from filtering water; they would starve without water. Also, they would most likely crush themselves because of their body weight if they were on land.
the new bud simply detaches from the parent body
Yes, for example, Jellyfishes are Cnidarians.
They could sting people.
i think a hydra has a incomplete digestive system called the-gastrovascular system
They are filter feeders that draw water into their pores, filter out tiny sea invertebrates that are absorbed and digested, and expel the remaining water in a continuous basis.
Medusae and complex swimming colonies can sense tilt and acceleration by means of chambers lined with hairs which detect the movements of internal mineral grains. If the body tilts in the wrong direction, the animal rights itself by increasing the strength of the swimming movements on the side that is too low. They also have "little eyes" known as ocelli, which can detect the direction from which light is coming. Although these probably do not form images, their lenses simply produce a clearer indication of the direction from which light is coming.
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I have to add that most species of box jellyfish have four groups of two complex eyes, and either two or four simpler ocelli, for a total of up to twenty four eyes. The complex eyes are similar to our own and have corneas, lens, and retinas. Tests have demonstrated their ability to navigate obstacles and recognize colors by way of their vision, although it has yet to be demonstrated that they can track prey. Their nervous system is not centralized, but it is a much more complex nerve net than other species of jellyfish. So far, some primitive learning and memory ability has been demonstrated in experiments.
Some facts about hydra are that if you cut off one head another grows back. Another fact is that it's a myth.
One adaptation of a cnidarian is the ability to regrow an entire body part. They also use stinging tentacles to catch prey. Jellyfish are cnidarians.
Adaptations? Stinging tentacles (cnidoblasts) - pronounced nie-doe-blasts - sensitivity to light, pulsing motility, life cycle stages that take advantage of protected and food rich environments.
Well hydra has no specialized organs for respiration but exchange of gases is carried ou' by entire bodyy surface. Oxygen and carbon dioxide diffuse from the body digestive system. Thus an efficient exchange is carried ou by enteron..