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Which type of blood vessel normally contains valves to keep the blood flowing in One Direction
a) arteries
b) veins
c) capillaries
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Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers
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Does all the energy stored by the phytoplankton reach the top level of the pyramid
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Which type of blood vessel normally contains valves to keep the blood flowing in One Direction
a)...
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