Most of Madagascar's native species exist only on Madagascar because the island
A. as among the largest on the earth.
B. is a biodiversity hotspot.
C. as been isolated for approximately 40 million years.
D. is tropical.
E. is situated far from other biodiversity hot spots..
Answer: C
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The outer core is
a. solid. b. liquid. c. gas.
The transitional depositional environment that involves progradation is a _______. Fill in the blank(s) with the appropriate word(s)
What institution created alternative food and currency markets to combat environmental decline?
a) Transition towns b) Intentional communities c) Cooperatives d) Land trusts
Humans have dramatically altered the rate of nitrogen fixation into forms usable by autotrophs ________
A) by producing synthetic fertilizers and applying them to crops, lawns, and parks B) due to the burning of fossil fuels to meet our energy needs C) because of the erosion of farmlands through poor agricultural practices D) by using antibiotics to reduce the numbers of denitrifying bacteria E) by selectively removing leguminous plants