Maize (corn) was domesticated in
A) Africa.
B) Europe.
C) Asia.
D) Mexico.
E) Australia.
Answer: D
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How many valence electrons does boron (B, atomic no. = 5 ) have?
A) 1 B) 2 C) 3 D) 4 E) 5
How is the phrase "the present is the key to the past" used in creating evidence for continental drift? What will be an ideal response?
Why are oceanic ridges elevated above the rest of the seafloor?
What will be an ideal response?
The Ekman spiral affects the direction of near surface water movement. If you lowered a current-measuring device over the side of a ship in the northern hemisphere, what would you observe?
a) Subsurface water would all be moving to the right of the wind direction. b) Subsurface water would all be moving to the left of the wind direction. c) Subsurface water would be sinking. d) As the instrument descended, the current direction would move progressively to the left of the wind until it actually was going in the opposite direction, and at greater depth it would move to the right. e) As the instrument descended, the current direction would move progressively to the right of the wind until it actually was going in the opposite direction, and at greater depth it would move to the left.