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Mechanics of feeding, enzyme action, and nutrient absorption. Respiration:

The strength of Berry’s text lies in its straightforward, exam-oriented approach. It covers the core systems (nervous, circulatory, respiratory, excretory, endocrine, and reproduction) with a good balance of vertebrate and comparative physiology. The diagrams are clear, though black-and-white in most editions. The language is precise but not overly verbose—ideal for last-minute revisions or building foundational concepts.