Have bodies made up of a series of rings separated by grooves Have bodies made up of many linked sections called segments Also have a one-way digestive system
Segmented Worms –closed circulatory system Closed circulatory system – blood moves only within a connected network of tubes called blood vessels
Closed Circulatory System v Open Circulatory System
Earthworms in the Environment Earthworms tunnel through the ground for a living They must stay in moist soil or damp air to keep their skin moist ---they breathe through their skin
Benefits to Gardening Earthworm tunneling loosens the soil, allowing air, water and plant roots to move through Earthworm droppings make the soil more fertile Earthworms bring nutrients to the surface of the soil through their waste
Observe the Mealworms and pass them around the class What type of worms are they? Are they nocturnal or active during the day time? Where do they live?
Surprise! Mealworms are NOT worms Some organisms that LOOOK like worms are actually larvae
Mealworms are actually the LARVA of a Darkling Beetle!
Mealworms: Live in cool or damp places Could live in your cupboards –they are attracted to grain!
Life Cycle of a Mealworm http://www.newton.k12.ks.us/tech/life_cycle _of_the_mealworm.htm http://www.newton.k12.ks.us/tech/life_cycle _of_the_mealworm.htm
Mealworm Life Cycle Egg7–14 days Larva30–90 days --5 molts occur Pupa10–20 days Adult5–10 daysBranApple The cycle continues.