What is a mass extinction?
a. The continuous extinction of various species
b. The result of excessive allopatric speciation
c. The result of accumulated harmful mutations
d. An occurrence when an entire phylum of cohorts dies off
e. A rapid increase in the rate of extinctions that reduces Earth’s biotic diversity
e
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Discuss the geographic inequities within China which have widened since the 1980s.
What will be an ideal response?
About one-fourth of the hurricanes that strike the United States produce tornadoes. Where do these tornadoes most often form in relation to the hurricane?
The basic building blocks of all matter are called ________
A) atoms B) electrons C) ions D) neutrons E) protons
Regional elevation can be increased by
A. eroding material from the top. B. thinning the crust. C. heating the crust and mantle. D. normal faulting.