Food chains and food webs explain the flow of energy through ecosystems.

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An ecosystem is a community of living organisms and their physical environment interacting as a system.

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Ecology is the study of interactions between organisms and their environment, including both living and non-living components.

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2024年8月6日 · Our new lessons are aligned with national education standards, each with an introductory video and accompanying activities. The curriculum highlights human characters from the stories and books in Khan Academy Kids. Seeing these vibrant animated characters experience BIG emotions is a fun way to help kids understand what they feel in real life.

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Introduction to lipids, their molecular structure, types, and functions.