What was charles darwin's contribution to the study of biology? a- he was the first person to recognize that organisms change over time b- he believed that organisms adapted through the inheritance of acquired traits c- he explained how traits are passed from parents to offspring d- he proposed that natural selection is the primary mechanism of evolution

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The correct answer is D. He proposed that natural selection is the primary mechanism of evolution. 

Darwin developed the theory known as "natural selection," which follows the "survival of the fittest" idea. This means that a species evolves based on which organisms within it are most fit for their environment. For example, if an animal lacks a specific trait needed to survive, it will likely die. The animal then cannot produce offspring and cannot pass down its traits. The animals that do have the specific trait, however, will likely survive. Its offspring will then acquire this trait and also be able to survive. Natural selection is the idea that species evolve based on the fact that "unfit" animals will die and "fit" animals will survive and pass down their traits. 

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