The environment plays an essential role in evolution. In a Darwinian sense, it determines which individuals and species will survive through the inexorable engine of natural selection. But a large number of environmental factors can also impact evolution and biology more directly, through epigenetic means: traits can shift through exposures to temperature and light or in response to nutritional parameters such as high fat or caloric restriction diets. A host of chemicals or toxins from plants and the general environment can impact phenotypic variation and health.
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