Animal and Plant Cell

Think you can tell a yam from a yak? Examine these still images of typical plant and animal cells from Biology by Kenneth R. Miller and Joseph Levine. What similarities and differences can you find?

Illuminating Photosynthesis

This interactive feature from the NOVA: "Methuselah Tree" Web site details the process of photosynthesis and its role in the oxygen/carbon dioxide cycle.

Life Before Oxygen

This Interactive NOVA: "Earth" video segment looks at ancient organisms that lived anaerobically, the origins of photosynthesis, and the new forms of life this process made possible.

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Photosynthesis

This video segment from Interactive NOVA: "Earth" looks at photosynthesis, the chemical process plants use to make their own food.

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Plants-in-Motion

While we tend to think of plants as stationary, they are in constant, though very slow motion, as they respond to environmental factors. Watch plants move in time-lapse videos in this interactive activity adapted from Indiana University.

Single-Celled Organisms

This video segment explores the astounding diversity of the world's smallest life forms: single-celled organisms.

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Studying Global Warming in Biosphere 2

In this What's Up in the Environment? video segment, an international team of scientists in Arizona's Biosphere 2 laboratory studies the impact of increased carbon dioxide emissions and how that might affect our future global environment.

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