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Annelids have segmented bodies, with both a nervous and circulatory system and a one-way gut. They have mastered the art of digging and live in an incredible diversity of habitats. Tube-dwelling worms live in mud flats, stabilizing the mud. Some eat the mud while others collect food from the surface with their tentacles. Blood sucking leeches live in fresh water. Digging in the soil, earthworms both aerate and release nutrients into the soil.
Next Generation Science Standards for this Video
The segmented body plan of an annelid worm with both circular and lengthwise muscles is the ideal structure for active burrowing.
Earthworms are important decomposers. Digging in the soil, earthworms both aerate and release nutrients into the soil.
The body plan animation visualizes the complex annelid structures and how they function:
- A long skinny segmented body
- Circulatory and nervous system
- Circular and lengthwise muscles
- One way gut
- Setae (These are not discussed in the video, but they are clearly evident in several sequences)
Community Developed Lesson Plans to Use with this Video