Species - a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce., Variation - Any difference between individuals of the same species., Evolution - Changes over time; the process by which modern organisms have descended from ancient organisms., Fossil - The preserved remains or traces of an organism that lived in the past., Adaptation - An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment., Scientific Theory - A well tested explanation for a wide range of observations and experimental results. Based on facts!, Mechanism - The natural process by which something takes place., Natural Selection - The process by which organisms that are best adapted to their environment are most likely to survive and reproduce., Competition - The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time., Homologous Structures - Similar structures that related species have inherited from a common ancestor., Embryological Development - The earliest developmental stages of an organism.,

Natural Selection and Evolution

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