What caused the collapse of the human population on Easter Island from its peak in 1550 CE?
A. A volcanic eruption buried the island in ash in 1588 CE.
B. Human activities overwhelmed the environment.
C. The society went through a demographic transition.
D. A series of tsunami hit the island in 1551 CE.
E. Dutch sailors introduced a foreign virus in 1722.
Answer: B
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In what form do aliphatic amines exist at physiological pH (pH= 7.4)?
A) largely as neutral molecules B) largely as their conjugate acids C) as a mixture of neutral molecules and their conjugate acid, but with a slight predominance of the conjugate acid D) as a 50/50 mixture of neutral molecules and their conjugate acids
Which of the following minerals does NOT have cubic cleavage?
a. magnetite b. galena c. pyrite d. halite
In your opinion, do hurricanes pose the greatest threat to the east or west coast of the United States? Explain
What will be the ideal response?
A swimming pool of water is best classified as a
A. heterogeneous mixture. B. pure compound. C. homogeneous mixture. D. pure element. E. It depends on how many children have been in it.