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8 Cards in this Set
- Front
- Back
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What is the most distinguishing characteristic of annelids? Why is it important?
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Segmentation; each segment has its own muscles that lengthen and shorten for efficient movement; groups of segments may take on specific function.
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Describe how bristleworms reproduce.
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Bristleworms and their relatives have separate sexes and reproduce sexually. Eggs and sperm are released into the water, where fertilization takes place
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How do earthworms improve soil fertility?
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As an earthworm burrows through the soil, it loosens, aerates, and fertilizes the soil
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Why are leeches classified in phylum Annelida?
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Leeches have segmented bodies just like other annelids
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Polychaetes actively swim, burrow, and crawl. How do parapodia support the active life that most polychaetes pursue?
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Parapodia can be used for swimming or crawling and in gas exchange
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Interpret the function of the muscular system in the earthworm as the animal moves through the soil.
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Circular muscles contract to move the worm forward. Longitudinal muscles contract to pull the worm’s body along
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tiny bristles that help segmented worms move by anchoring their bodies in the soil so each segment can move the animal along.
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setae
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sac with muscular walls and hard particles that grind soil before it passes into the intestine; common in birds and annelids such as earthworms.
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gizzard
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