Which of the following is true of the atoms in the backbone unit of a protein?
A) They all are in a straight line.
B) They are all in the same plane.
C) They all have tetrahedral geometry.
D) None of these is correct.
B
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When Earth's continents were assembled as Pangaea, they covered much of Earth's surface that lies near the equator. Why did this warm the Earth's climate?
A. The Sun's most intense radiation struck land instead of water. B. It restricted the flow of surface currents. C. both of the above D. neither of the above
Recent advances in the recovery and analysis of human genetics has begun to ?ll in the map of early human migration
Indicate whether the statement is true or false.
Which is not true of geographers?
A) They are Earth systems scientists. B) They are primarily concerned with place names. C) They are concerned with spatial and temporal relationships. D) They use spatial analysis.
Most humans rely on just a few of the world's animal and plant species for food because only a few
A. Have been discovered. B. Are available. C. Food types are what we are accustomed to eating. D. Are edible. E. All of these are true.