Friday, May 26, 2017

Cnidaria


Post your facts directly here in a bulleted format. Questions to get you start: 
  • what do they look like?
  • what makes them an animal? 
  • what do they eat? 
  • where do you find them? 
  • any interesting/unique behaviors? 

5 comments:

  1. Cnidaria:
    1. They are a marine species and live in an exclusively aquatic environment
    2. They have stinging cells on their tentacles that are used for capturing prey
    3. They have a digestive cavity with one opening that serves as the mouth and
    waste area

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  2. 1. There are 9,000 species.
    2. Are either bell-shaped and mobile (jellyfish) or tubes anchored to one spot (coral).
    3. Lack many features of the animal phyla such as internal organs and central nervous systems. Instead, their nerves are organized in nerve nets that cover the entire body.

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  3. 1. Cnidarians can weigh up to several tonnes.

    2. Some of the chemicals produced by corals help humans learn about anti-cancer drugs, and the disease itself.

    3. There are four main classes of Cnidarians. Anthrozoa consists of corals and sea anemones. Scyphozoa consists of jellyfish and siphonophores. Cubuzoa consist of box jellyfish. Hydrozoa consists of various spectrums, or hydrozoans.

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  4. 1. They can eat organisms as small as plankton or several times the size of themselves. They predominantly eat creatures from the "dinoflagellates" phylum.
    2. Have been found fossilized dated back 580 million years ago, but mitochondrial evidence points to nearly 720 million years ago.
    3. They typically do not have complex digestive and circulatory systems and have a very simple nervous system.
    -Conor Fitzgerald

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  5. 1. Cnidarians have been found fossilized and dated back 580 million years ago, while other evidence suggests their existence to be as old as 720 million years ago, putting them before the Cambrian explosion.
    2. Their prey can include anything from plankton to organisms several times their own size.
    3. They have a very rudimentary form of centralization, with hardly what is considered a brain, but this neural tissue connects its nerve nets which span its body.

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