A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean. What is the average gradient?
A) 0.5 km/in B) 2 km/m C) 2 m/km D) 0.5 m/km
D
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Why do food chains and webs rarely support more than four or five trophic levels?
What will be an ideal response?
When a message molecule binds to a receptor,
A. the cell begins to grow and divide. B. the target cell passes the message molecule to another target cell. C. a series of chemical reactions begins. D. the message molecule enters the target cell.
What was the driving mechanism proposed by Hess to explain sea floor spreading?
a. downwelling oceanic currents b. hydrothermal cells c. thermal convection cells d. motions in the outer core e. thermal convection cells AND motions in the outer core
Road building in forests can lead to fragmentation as well as erosion.
Answer the following statement true (T) or false (F)