8.3 | solid domestic waste
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8.4 (C.3.2) | Defense against disease
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8.4 | human population carrying capacity
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8.6 (C.2.2) | Neural signaling
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8.7 (B.3.3) | Muscle and motility [HL]
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8.8 (C.2.1) | Chemical signaling [HL]
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8.9 (C3.1) | Integration of body systems
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9.1 (D3.1) | Reproduction in Plants
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