American Museum of Natural History
The Tree of Life
Groups of species can have more in common than meets the eye. An interactive cladogram shows some of the connections between important groups of species. Learners click on sections of the diagram to learn more about the connections or on...
Curated OER
Rain Forest Biome and the Effects of Acid Rain
Students examine how acid rain affects the rain forest. They identify the causes of acid rain, determine how human behavior can affect the environment and discuss ways to prevent acid rain and acid rain damage to the rain forest.