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Biology, 22.06.2019 10:00
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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Biology, 22.06.2019 10:30
The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere
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Biology, 22.06.2019 13:30
The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?
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Mathematics, 14.10.2019 20:20
English, 14.10.2019 20:20
Mathematics, 14.10.2019 20:20
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History, 14.10.2019 20:20
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Mathematics, 14.10.2019 20:30
Mathematics, 14.10.2019 20:30
Mathematics, 14.10.2019 20:30
Mathematics, 14.10.2019 20:30