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series, emphasize "learning by doing" with integrated experiments and lab activities. Accessing Digital Resources Unit 1: The Human Body and Health –

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Textbooks for 1st-grade students focus on foundational biological and environmental concepts:

• Unit 1: The Human Body and Health – Digestive, respiratory, and circulatory systems; nutrition and health.
• Unit 2: Reproduction and Development – Human reproductive system, puberty, and sexual health.
• Unit 3: Ecosystems and Biodiversity – Food chains, biomes, and human impact on the environment.
• Unit 4: Matter and Energy – Atoms, chemical reactions, and forms of energy.
• Unit 5: Earth and Space – Plate tectonics, the solar system, and climate.

• ✅ Índice interactivo para navegación rápida.
• ✅ Resolución de actividades incluidas (si aplica).
• ✅ Compatible con móviles y tablets.