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Carbon dating assumptions

See Box 6-1 for a summary of these four core ideas and their components.

These four core ideas, which represent basic life sciences fields of investigation—structures and processes in organisms, ecology, heredity, and evolution—have a long history and solid foundation based on the research evidence established by many scientists working across multiple fields.

The study of life ranges over scales from single molecules, through organisms and ecosystems, to the entire biosphere, that is all life on Earth.Yet what is learned about the function of a gene or a cell or a process in one organism is relevant to other organisms because of their ecological interactions and evolutionary relatedness.Evolution and its underlying genetic mechanisms of inheritance and variability are key to understanding both the unity and the diversity of life on Earth.Such adaptations can eventually lead to the development of separate species in separated populations.Finally, the idea describes the factors, including human activity, that affect biodiversity in an ecosystem, and the value of biodiversity in ecosystem resilience.

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