Have you ever wondered why animals have different kinds of feet? This leveled text introduces beginning readers to four different kinds of animals and how their

A thoroughly updated version of the successful first edition, with a new chapter on Real-Time PCR, more prokaryotic applications, and more detail in the complex

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Essentialism is the idea that certain categories, such as "dog," "man," or "intelligence," have an underlying reality or true nature that gives objects their id