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Author Question: The concentration of atmospheric lead increased substantially during the 1990s. Indicate whether ... (Read 36 times)

renzo156

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on: Jul 13, 2018
The concentration of atmospheric lead increased substantially during the 1990s.
  Indicate whether the statement is true or false

Question 2

Carbon monoxide forms in forest fires.
  Indicate whether the statement is true or false


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rachel

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Reply #1 on: Jul 13, 2018
Answer to Question 1

False

Answer to Question 2

True


renzo156

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Reply 2 on: Jul 13, 2018
Wow, this really help

xiaomengxian

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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