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Download Grade 6 Science Study Guide Geologic Time Major subdivisions of
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Grade 6 Science Study Guide Geologic Time Major subdivisions of geological time based on differences in life forms Era Trilobites Organisms that lived hundreds of millions of years ago with bodies divided into three sections Precambrian The longest geological part of Earth’s history cyanobacteria One of the earliest life forms which gave off oxygen Flying animas that evolved from dinosaurs Birds Pangaea The single landmass that once contained all Earth’s continents Epoch Smaller units of time in a geologic period Jurassic The time period where dinosaurs were the dominate life form The division of Earth’s history into time units The longest subdivisions of geological time Geological time scale eons Major division of an era The change in organisms over time Period Organic evolution A group of organisms that normally reproduce with other members of their group Species Process by which certain organism survive and reproduce Epoch Seed plants which first appeared in the Paleozoic Era Gymnosperms The era of “middle life” Mesozoic Most recent period in the Mesozoic era Cretaceous Oldest period in the Mesozoic Era Triassic Southern part of Pangaea Gondwanaland Milk production animals; first appeared in the Triassic Period Mammals Flowering plants Angiosperms The most recent era Cenozoic The most recent period in the Cenozoic Era Quaternary Evolve To change and adapt This animal is capable of living life on land and in water Scabby skin, cold blooded Amphibian Reptile The element found in all forms of life Carbon An animal with a backbone Vertebrate An animal with NO backbone Invertebrate Any living thing Organism The basic unit of all life Cell A group of like cells that do a job Tissue A group of tissues to form organs Organ Organ system A group of similar organs Earliest life form; mostly unicellular Bacteria Bacteria are single-celled, prokaryotic organisms that occur alone or in chains or groups belonging to Kingdom eubacteria The oldest organisms living on Earth unicellular Kingdom Archaebacteria An English naturalist who’s theory of evolution explains how species of living things have changed over time Charles Darwin
