Blood flowing back to the heart travels in

A. capillaries.
B. veins.
C. arteries.
D. all of the above


Answer: B

Environmental & Atmospheric Sciences

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Which of the following must we know when we carry out a titration?

A) the concentrations of all reactants except one B) the stoichiometric ratio of the reactants C) the volumes all reactants D) all of the above

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The majority of the water outside of the oceans is in the form of:

A) groundwater. B) glacial ice. C) lakes. D) streams. E) water vapor in the atmosphere.

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Cis-trans isomers do not exist for which of the following compounds, all of which have the molecular formula C3H4Br2?

A) 1,1-dibromopropene B) 1,2-dibromopropene C) 1,3-dibromopropene D) They do not exist for any of these three molecules.

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The tidal current in a narrow tidal channel is likely to ________.

A. change direction as the tides change B. be unidirectional at all times C. have a distinct rotary component D. be nonrotary E. change direction as the tides change and be nonrotary

Environmental & Atmospheric Sciences