Seventy percent of the earth's surface is covered in water. What's in all that water? A lot of life! This lab explores the impact of pollution on water microorganisms using a bioassay with Daphnia (water fleas). Students will measure the toxicity of common household pollutants by examining survival rates of Daphnia when they are exposed to these chemicals. In addition, students will classify a variety of water organisms into kingdoms and phyla.Back to Labworks!