Which human activity has the most negative effect on the stability of a river environment? A. People picnicking along the bank of the river B. Sailboats being stored in the river C. Driving a car near the river D. Boats leaking oil into the river

Name the type of chemical that speeds up digestion

Which best describes carbon dioxide’s path out of the body

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.