SCIENCE
(4) 4-6 Science Concepts series. Published in spring 1998. Because of the varying complexity of the topics covered, this series is somewhat uneven. The books on evolution and photosynthesis, two key concepts in biology, stay close to the stated topic, while the books on symbiosis and food chains, more peripheral subjects, cover a broader range of material. Captioned color photographs accompany each clearly written text. Bib., glos., ind.

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