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Welcome to MooMooMath and Science.

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In this video I would like to talk about the phylum Annelida.

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The phylum Annelida are made up of worms in which the bodies are made up of a series of

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identical segments that runs from their head to their tails.

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Some common examples include the earthworm, leeches, clamworm, and fireworms.

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Here are a couple more characteristics of these worms

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They have bilateral symmetry

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They also include tissues and organs

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They have a fluid filled internal cavity

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Their body possesses a digestive system with a mouth and an anus

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They have a nervous system with a ventral nerve cord

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They have a closed circulatory system They do not have respiratory organs

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They reproduce sexually and some are hermaphrodites

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Probably the most common analid is the earthworm.

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There are more than 27,000 kinds of earthworms.

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They range from a half inch in length to the largest recorded earthworm ever was 22 feet.

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Earthworms exist in great numbers and it is estimated that in a single acre of soil there

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There may be up to a million earthworms.