Dunes formed when strong winds break through transverse dunes to make new dunes whose ends point upwind are called
a. longitudinal dunes
b. star dunes
c. barchan dunes
d. parabolic dunes
Answer: d. parabolic dunes
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According to the following reaction, which molecule is acting as an acid?OH- + NH4+ ? H2O + NH3
A.
| H2O |
B. NH3
C. OH-
D.
| NH4+ |
E. none of the above
Transpiration is:
A) the type of bond that holds water molecules together. B) the return of water to the oceans via rivers. C) the process by which plants release water into the atmosphere. D) the movement of groundwater under Earth's surface.
Which of the following is often true of the active site of an enzyme?
A) It consists of amino acids near both the N-terminus and C-terminus. B) It consists of amino acids which are adjacent to each other. C) It consists of amino acids which not adjacent to each other. D) None of the above is true.
If a species becomes isolated from another for a long time as a result of a barrier, speciation will not occur.
Answer the following statement true (T) or false (F)