What form of diffusion is represented by the spread of Wal-Mart?
A. reverse hierarchical
B. stimulus
C. cascade
D. relocation
Answer: A
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Bacteria
A. sometimes gather in multicellular clusters. B. cause diseases such as Lyme disease, tuberculosis, and malaria. C. play an important role in decomposition. D. both A and C
What is usually the highest point on a beach?
A) Backshore B) Berm crest C) Beach scarp D) Longshore bars
The air pressure normally ____ before a cold front passes and ____ after a cold front passes
A) drops; drops B) drops; rises C) rises; rises D) rises; drops
The difference between open and closed systems is that
A. open systems can acquire matter and energy, but closed systems cannot. B. open systems are not predictable but closed systems are. C. open systems are much simpler in terms of the number of interactions between objects in the system. D. open systems occur on land and closed systems occur in the ocean.