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Photosynthesis also generates the oxygen that animals need to survive. Here, take a closer look at the oxygen/carbon dioxide cycle and the process of photosynthesis. Explore how photosynthesis works by helping the process along in this game. When oak trees shed huge numbers of acorns every few years, it has ramifications throughout the ecosystem. In the search for alternatives to gasoline, are algae the answer? In this animated primer, learn why algae and other plants make oil, and how algae oil gets converted to biodiesel. How does a 675 million-year-old angiosperm measure up to a lily of today? National corporate funding for NOVA is provided by Cancer Treatment Centers of America. Major funding for NOVA is provided by the David H. Support provided by: Photosynthesis in plants and a few bacteria is responsible for feeding nearly all life on Earth. We exhale the carbon dioxide that plants need for photosynthesis. It allows energy from the sun to be converted into a storable form, usually glucose, which plants use to grow and thrive.

But here we animals repay the favor.

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