How scientists study Evolution?
Posted by Josyvan , 7/9/2007 7:42:40 PM
How scientists study Evolution?
Introduce of Evolution
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Species do not change overnight, or even in the course of one lifetime. Rather, evolutionary change usually occurs in tiny, almost imperceptible increments over the course of thousands of
Fossils
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Midge Fly Caught in AmberPaleontologists can learn about prehistoric life by studying the remains of ancient insects, such as this midge fly, trapped in tree resin when they were alive. TheDistribution of Species
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OstrichesThe distribution of the world’s flightless birds, called ratites, is indicative of the shifting of continents in the Earth’s distant past. Ratites evolved on a landmassAnatomical Similarities
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Analogous and Homologous StructuresStructures that are similar due to evolutionary origin, such as the forearm bones of humans, birds, porpoises, and elephants, are called homologous.Molecular Similarities
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DNA MoleculeA DNA molecule consists of a ladder, formed of sugars and phosphates, and four nucleotide bases: adenine (A), thymine (T), cytosine (C), and guanine (G). The genetic code isDirect Observation
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Fruit Fly Laying EggThe small vinegar flies of the family Drosophilidae, commonly called fruit flies, have been exceptionally useful in scientific research. Their short reproductive cycle (aDetermining Life’s Origins
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Evolution of Air-Breathing OrganismsBoth the lung structure of air-breathing organisms and the swim bladders of most modern fishes evolved from paired air sacs of primitive bony fishes. In the
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