Curated OER
WORM WATCHING
Students investigate how earthworms help build good soil. They examine the worms carefully to find the ringlike segments and swollen band at the front of the earthworm's body. Students take turns dampening the soil every day and adding...
McGraw Hill
Glencoe Biology: Excretory System: Self Check Quiz
This multiple-choice quiz on the excretory system allows students to get hints for each question and check their answers after submitting.