What are the prevailing winds in the United States?
a. westerlies
b. easterlies
c. southeast tradewinds
d. northeast tradewinds
e. doldrums
ANSWER: a
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Which of the following is the greatest threat to biodiversity?
A) overharvesting of commercially important species B) introduced species that compete with native species C) pollution of Earth's air, water, and soil D) disruption of trophic relationships as more and more prey species become extinct E) habitat alteration, fragmentation, and destruction
Describe, in order from outside to inside, the cell layers of the typical plant root. Trace the path of water entering the root
What will be an ideal response?
During pollination of flowering plants, pollen lands on the:a
stigma. b. style. c. carpel. d. anther. e. filament
Which of the following mechanisms can drive evolution?
A) Mutations B) Genetic drift C) Natural selection D) All of the above