The four primary animal tissues — epithelial, connective, muscular and nervous — their types, locations and functions.
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The most repeated human-biology facts — hormones, blood, nerves, vitamins — condensed for rapid revision.
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Phylum-by-phylum diagnostic features from Porifera to Chordata, with examples.
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Branches of biology, the origin of life from Oparin-Haldane to Miller-Urey, and the mechanisms and evidences of organic evolution.
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Diagnostic features and examples of the major animal phyla from Protozoa through Chordata, with the classic comparison table.