[2014] Megan Pickering: Megan Pickering Science

Megan Pickering

Science

Flatworm- tiger flatworm or divided flatworm

Segmented worms have 3 main groups, earthworms, leeches, and polychaetes (they live in the ocean). These worms move around by contracting their segments, and have circulatory systems with blood.Roundworms are found in fresh and saltwater, also in humans and animals. They are parasites. Most flatworms are parasitic, and basically all of them live in environments with water. Since they have no specialized circulatory systen, they obtain oxygen by diffusion.

Roundworm- whipworm

Segmented Worm- leech

Similarities-*All these worms have bilateral symetry.*Some species of flat and round worm are parasitic.Differences-*Only segmented worms have segments.*Flatworms don't have circulatory systems. Segmented and roundworms do.

Orsak's Flatworm

Leech swallows earthworm