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information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived, and the order in which they lived
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
tiny bubble, formed of large organic molecules, that has some characteristics of a cell
theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms
process by which unrelated organisms independently evolve similarities when adapting to similar environments
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