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The brain, the beginning of the digestive system, and the five aortic arches are all in the head end. They are visible during a dissection.


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In the animal phyla why is the segmentation an important development?

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What structure separate the coelom of an earthworm?

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What is metamerically segmented?

If an organism is "metamerically segmented", it is composed of many connected parts which are very similar in structure. For example, an earthworm is metamerically segmented, because if you look at it you can see lots of little rings. Check the Wikipedia page on "Metamerism" for more information.


An earthworm has an anterior ganglion This structure is part of the?

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How would you describe the structure of an earthworm's body?

I don't know if I got the answer