Examines the importance of biodiversity, discussing animals in crisis and the ways science is fighting to counteract the impact mankind has had on the environment and endangered species.
Discusses dinosaurs and different theories regarding their extinction, including climate changes, starvation, cosmic rays, and an asteroid collision with the earth.
Explores causes of the past five mass extinctions and looks at the sources of extinctions happening today. Also explores what evolutionary theory predicts for the future.
A presentation of dinosaurs as they are viewed by paleontologists, using up-to-date methods to discuss what dinosaurs were, what they did, and how they did it, and studying the dinosaur in relation to the fuller concept of natural history.
Explains how scientists determine whether an animal species is threatened or endangered; discusses several species threats and conservation efforts, including the rescue of northern sea otters after the Exxon Valdez oil spill; and presents a hands-on investigation of chemical levels in two bodies of water.
Explores the debate over whether the mass extinctions that changed the face of the Earth sixty-five million years ago were caused by an asteroid impact, or by massive volcanic eruptions.
