SHARKS

Enough action-filled underwater shark photos to delight even the most bloodthirsty enthusiast, though the author notes that ``You are about fifty times more likely to be killed by a bee sting than a shark.'' She discusses shark anatomy, evolution, habits, and reproduction (live birth, egg, and combinations), with a special section on the uses of sharks in medical research: preventing tumors, treating burn victims, studying heart and kidney disease, and providing some answers to human immune-system diseases. Cerullo also includes a generous number of fascinating facts (``It has been estimated that a good sized shark may go through 20,000 teeth in ten years'') and makes a plea for shark conservation. Lively and impressively detailed. Shark quiz; bibliography; index. (Nonfiction. 10+)