Big Bang Theory - how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching, Biological Species - a group of organisms that can reproduce with one another in nature and produce fertile offspring, Deceased - dead; no longer living, Element - cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter, Eukaryotic Cell - any cell or organism that possesses a clearly defined nucleus, Prokaryotic Cell - any organism that lacks a distinct nucleus and other organelles due to the absence of internal membrane, Evolution - the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth, Fossil - the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock., Geologic Time Scale - a representation of time based on the rock record of Earth, Homologous Structures - suggest that organisms have independently evolved similar traits, Natural Selection - the process through which species adapt to their environments, Originate - have a specified beginning, Selective Breeding - the process of modifying the characteristics of living things especially to enhance one or more desirable traits, Speciation - the formation of new and distinct species in the course of evolution., Supernova - a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass., Theory - a carefully thought-out explanation for observations of the natural world that has been constructed using the scientific method, Vestigial Structures - a feature that a species inherited from an ancestor but that is now less elaborate and functional than in the ancestor.,

Grade 8 Unit 5 Vocabulary

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