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offers activities, animations, and lessons on cells, diversity of life, ecology, evolution, heredity and genetics, and the human body. Topics include cell division, embryos, energy, genes, traits of life, muscles, eyes, optical illusions, depth perception, mutant fruit flies, frogs, extremophiles, bacterial terrarium, mold, yeast, and more. (Exploratorium, National Science Foundation)
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Only a fraction of all the existing life forms have been identified. To fill in our picture of the living world, biologists search for new species -- groups of organisms that reproduce with one another and share a common evolutionary history. Once a new species has been identified, biologists give it a name that reflects its relationship to other species. |
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Chick embryo |
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