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Fossils of the first multicellular, soft bodied marine organisms were found in rock unit D. Identify the eon that indicates the geologic age of this rock unit.
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Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions
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Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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What factors contribute to the effect an environmental toxin has on the human body?
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Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species
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Fossils of the first multicellular, soft bodied marine organisms were found in rock unit D. Identify...
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