In life’s hierarchy of organization, new properties emerge at each levelContinuing down the hierarchy of lifeLiving organisms interact with their environments, exchanging matter and energyCells are the structural and functional units of lifeThe unity of life: all forms of life have common featuresThe diversity of life can be arranged into three domainsEvolution explains the unity and diversity of life• Observation 1: Individual variation• Observation 2: Overproduction of offspring• Inference 1: Unequal reproductive success • Inference 2: Over time, favorable traits accumulate in a populationAn example of natural selection in actionScientist use two main approaches to learn about
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