Closed circulatory system : Blood moves inside the blood vessels, Open circulatory system: Blood leaves the blood vessels and sloshes inside the body

They feed on dead ,decaying materials and attack smaller animals than them.

Do not have distinct front or back ends, live in water, moved along the water currents/creep along the bottom

An organism that lives inside or on other organism

flatworms, roundworms, and segmented worms

Sexual and asexual

It improves the soil in which plant grow. Earthworms tunnels loosen the soil, allowing air, water and plant roots to move through it

Flatworms

Bilateral symmetry

Larger, more complex, move more quickly, have sense organ in the front end