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Hi guys, today we are going to learn about Peripherals and Synergians with Nico, Amalia

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and Paula.

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Ok, I know this can be hard, so let's start with a description.

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Peripherals are aquatic sea animals that live mainly in the sea.

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Their bodies have radial symmetry and they do not have trititious organs.

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Some characteristics that we find in Peripera are that their bodies are sag-shaped and that they have an internal skeleton that protects them.

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It can be composed of rigid spines called spicules or of flexible fibers called sponges.

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Some characteristics that we also can appreciate are, for if they are fed by using a filtration process,

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chemisites create a stream of water that travels through their pores.

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These bodies take nutrients and oxygen from the water and waste leaves the body through this column.

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They perform sexual reproduction by forming cells that join together to produce larvae.

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However, they can also perform a sexual reproduction by fragmentation, since they can regenerate

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very quickly.

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Now, we are going to see the parts of the peripherals.

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Porosites have two anocytes with cells that coat the inner cavity, creating a flow bar.

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They also filter food.

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Porosites are the cells that allow water to flow through the periphery.

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There's a funny name, cell-called incubant pores, which are found in the external layer of the sponge.

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And lastly, the osculum is within a hole where waste goes out.

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Now let's see what cnidarians are.

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Cnidarians are aquatic animals that have radial symmetry, and their cells are grouped into simple tissues.

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Some cnidarians are organs, and we divide them into two groups.

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Cnidarians are sag-shaped, sessile cnidarians.

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Some have an internal skeleton consisting of its peepholes, but others have a mineral external skeleton.

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They can grow individually or in colonies and form a crop.

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Jellyfish are also another type of cinedrions, which are umbrella-shaped cinedrions.

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They have a hydrostatic skeleton, meaning they keep inside water by collecting water inside their cells.

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During their life, some canarians only take on the form of polyps.

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Some adopt the form of the jellyfish and some both.

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Let's see some characteristics.

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They have a digestive cavity that communicates with the outside through a hole that functions as a mouth and an anus.

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Also, tentacles are found around these orifices.

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The spinidoblasts are found in tentacles, and these are thin cells with coiled flagellum that can inject a liquid into prey, and this can paralyze the prey.

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They are all cannibals. They don't have a respiratory system, nor an excretion system.

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Every cell individually carries out gas exchange and the elimination of waste products.

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Jellyfish perform sexual reproduction, and polyps reproduced by asexual matters.

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And that's all you need to learn from now.