As successional changes occur in an ecosystem, new species take advantage of new conditions. Where do these new species come from?
A) They evolve from other species in the immediate region.
B) They come from surrounding ecosystems in other stages of succession.
C) They are planted by forest rangers who are managing these forest ecosystems.
D) The seeds of the new species are carried in by large streams and rivers.
B
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What valuable commodity has yet to be commercially mined from ocean sediments?
a. Natural gas b. Gravel c. Diatomaceous earth d. Manganese nodules
Which of the following is NOT one of the four major religions for the Russian region?
a. Uniate b. Orthodox Christianity c. Daoism d. Sunni Muslim e. Tribal Religions
All of the following are warm currents, EXCEPT
A. Canary Current. B. North Atlantic Drift. C. South Equatorial Current. D. Gulf Stream.
The crests of mid-oceanic ridges are associated with ________.
A. barrier reefs B. Benioff zones C. pelagic sediments D. rift valleys E. abyssal plains