Science 101: Ecology and Bio-Diversity

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Last year, New York City's 4th and 8th graders scored below both the state and national averages on a nationwide science exam. Every day over the next week, we'll take a few minutes to get to the bottom of some common science questions.

Today, Eleanor Sterling, director of the Center for Biodiversity and Conservation at the American Museum of Natural History, answers science exam questions about species and bio-diversity.