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Biology Chapter 17

Final Review

QuestionAnswer
Fossils Include footprints, eggs, or other traces of organisms. From in sedimentary rock.
Six components of Earth's early atmosphere hydroggen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water.
Liquid water first appeared on earth when? 3.8 billion years ago.
Miller and Urey's expirements Suggested how mixtures of the organic compounds necessary for life could have arisen from simpler compounds present on a primitive Earth. Amino acids were formed after gasses in Earth's atmosphere were passed through with electric sparks.
Macroevolution large-scale evolutionary changes hat take place over long periods of time. Includes mass extinctions, adaptive radiation, convergent evolution, coevolution, punctuated quilibrium, and changes in developmental genes.
Mass Extinctions when huge numbers of species disappear.
Adaptive Radiation when a single species or small group of species evolves into several different forms that live in different ways. Many species evolve from one
Convergent evolution unrelated organisms come to resemble one another because of similar adaptions to similar conditions
Coevolution Two species evolve in response to changes in each other.
Punctuated Equilibrium there are long, stable periods interrupted by brief periods of rapid change.
Relative Dating age of a fossil is determined by comparing its placement with that of fossils in other layers of rock or index fossils.Allows paleontologists to estimate a fossil's age compared with that of other fossils.
Radioactive dating use of half-lives to determine the age of a sample. Scientists calculate the age of a sample based on the amt. of remaining radioactive isotopes it contains.
Half-life length of time required for half of the radioactive atoms in a sample to decay.
Created by: numchuckskillz
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