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Author Question: The most productive systems on land are A) natural prairies. B) grasslands. C) forests. D) ... (Read 60 times)

jace

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on: Jul 16, 2018
The most productive systems on land are
 
  A) natural prairies.
  B) grasslands.
  C) forests.
  D) tundra.

Question 2

In 1948 in Donora, Pennsylvania, the routine release of toxins into the air became a deadly fog because of
 
  A) a chemical spill in the nearby Monongahela River.
  B) greatly increased activity of the nearby industries.
  C) a thermal inversion and stagnant weather conditions.
  D) the failure of the chemical scrubbing systems on smokestacks.


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macagn

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Reply #1 on: Jul 16, 2018
Answer to Question 1

C

Answer to Question 2

C


jace

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Reply 2 on: Jul 16, 2018
:D TYSM

xthemafja

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Reply 3 on: Yesterday
Wow, this really help

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