Dentro de los seres vivos

This book, translated into Spanish, provides an introduction to the biology of plants and animals, including humans. The book begins with a comparison of plant and animal cells. It describes the most important parts and functions of each type of cell. The book then explains how cells combine to form various types of tissue, tissues combine to form organs, and organs work together as parts of body systems. Each part serves an essential role in an organism's survival.

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