The gradual establishment of communities in areas where soil did not previously exist is known as ____________________.
Fill in the blank(s) with the appropriate word(s).
primary ecological succession
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What are Darwin's postulates of natural selection?
Since 1960, the human population has increased by more than
A) two times. B) twenty times. C) ten times. D) six times.
Why might coating a metal with another metal that is harder to oxidize prevent the first metal from being oxidized?
A) It doesn't prevent it, but helps to slow it down. B) All of the oxidizing agent is consumed using up the easily oxidized metal. C) The metal that is coated is protected from moisture and oxygen so it doesn't react. D) The metal that is acting as the coating is protected from moisture and oxygen. E) all of the above
The background stars of a lunar eclipse are those of constellations
A) of the opposite season. B) seen in the nighttime sky. C) not seen normally. D) seen in the opposite hemisphere.