Alien invaders ________.
A. blend into the existing ecological community
B. dominate the system and spread rapidly
C. remain at low abundances for several decades
D. persist for several decades and then disappear
E. None of these is correct.
Answer: B
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The mighty Columbia River forms the boundary between Washington and Oregon, but this river and its tributary, the Kootenay River, begin in ________
Fill in the blank(s) with correct word
The greatest number of galaxies belong to the type known as elliptical galaxies
Indicate whether the statement is true or false
Where are coral reefs almost entirely found?
A. equatorial islands B. on west coasts C. between the tropics D. on east coasts E. volcanic islands