Which statement best describes the movement of water in this system?
a. Water moves in both directions, but net movement is from A to B.
b. Water only moves from A to B.
c. Water moves in both directions, but net movement is from B to A.
d. Water only moves from B to A.
e. There is no net movement of water.
a
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Even though seawater continues to dissolve minerals from rocks and new minerals are added from the interior of the earth, the salinity of the oceans is not increasing over time. Explain 3 reasons that cause this
What will be an ideal response?
Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few groups of nitrogen-fixing bacteria. B. the breakdown of minerals. C. a few genera of detritivores. D. the breakdown of dead plants. E. nitrogen-containing fertilizers.
According to Oparin's theory for the origin of life, the prebiotic atmosphere:
A) already contained some primitive RNA molecules. B) basically was very similar to the atmosphere of today. C) contained many amino acids. D) had an abundance of methane, ammonia, and water. E) was rich in oxygen.
Which susbstance must a green plant obtain from its environment to carry on photosynthesis?
a. glucose and water b. oxygen and chlorophyll c. carbon dioxide and water d. carbon dioxide and oxygen