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8 Cards in this Set

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