What is the main unifying concept in biology, explaining how the diversity of life on Earth arose and how species change over time in response to changes in their environment?

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Evolution is the main unifying concept in biology that explains both the diversity of life on Earth and how species change over time in response to changes in their environment. Biodiversity refers to the variety of living organisms in an ecosystem, but it is a consequence of evolution. Environmentalism is a movement concerned with protecting the environment, but it is not a scientific concept. Development refers to the processes that lead to the growth and differentiation of cells and tissues, but it is not directly related to explaining the diversity of life on Earth or species change over time.

What Is the Main Unifying Concept in Biology, Explaining How