Why does the number of species on an island level off at S?
A. Because resources become scarce as
more species colonize an island.
B. Because predation increases as more
species colonize an island.
C. Because extinction rates increase as more
species colonize an island.
D. Because colonization rates eventually
decrease.
E. All of the answer options are correct.
F. None of the answer options is correct.
E
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There are currently two large, permanent bridges that span the Panama Canal. The bridges are about eight miles apart. If snapping shrimp avoid swimming at night and avoid swimming under shadows, then what do these bridges represent for the snapping shrimp
A) sources of refuge B) geographic barriers C) sources of a hybrid zone between the two bridges D) sources for increased gene flow
Which of these methods of heat transfer is not relevant to biological systems?
A. radiation B. conduction C. convection D. evaporation E. reflection
The structure of DNA is often described as a twisted ladder. The rungs of the ladder represent the sugar phosphate chains. Is this an accurate description? Why or why not?
What will be an ideal response?
The difference in the appearance of the male and the
female is known as a. polymorphism. b. sexual dimorphism. c. the dioecious condition. d. sexual selection. e. a primary sexual characteristic.