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chapter 23 Bio

chapter 23

QuestionAnswer
Macroevolution Broad evolutionary changes above the species level
Fossil Record Evidence showing how organisms arise, diversify, and decline over time
Radiometric Dating Dating rocks by measuring radioactive elements that decay at known rates
Hadean Eon 4.6–4 billion years ago; Earth and solar system formed
Archaean Eon 4–2.5 billion years ago; prokaryotes arose
Proterozoic Eon 2.5–0.55 billion years ago; eukaryotes and animals arose
Phanerozoic Eon 550 million years ago–present; major diversification of multicellular life
Stromatolite Layered rock formed by prokaryotes binding thin films of sediment
Cambrian Explosion Rapid diversification of life during the early Phanerozoic
Plate Tectonics Movement of Earth's oceanic and continental plates
Continental Drift Movement of continents that alters habitats and affects evolution
Pangaea Supercontinent formed about 250 million years ago
Mass Extinction Event where more than 50% of marine species become extinct
Extinction Loss of a species from Earth
Adaptive Radiation Rapid diversification of a lineage into different species with different adaptations
Evolutionary Trend Pattern caused by interactions between organisms and their environments
Species Selection Process where differences among species affect broader evolutionary patterns
Evolution Is Not Goal Oriented Evolution does not have an intrinsic drive toward a specific phenotype
Evolution Is Not Linear Evolution produces branching diversity rather than one straight progression
Created by: 808kadynt
 

 



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