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Author Question: When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over ... (Read 52 times)

james0929

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When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over time because ________.
 
  A) they are washed away by seasonal rains, but residual fertilizers remain
  B) organisms in the soil develop a resistance to these fertilizers
  C) more and more genetically engineered crops are being planted
  D) synthetic fertilizers provide no organic bulk

Question 2

Ozone, O3, is ________.
 
  A) a pollutant
  B) a naturally occurring compound
  C) an elemental material
  D) all of the above



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kardosa007

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Answer to Question 1

D

Answer to Question 2

D




james0929

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Reply 2 on: Aug 27, 2018
Thanks for the timely response, appreciate it


lkanara2

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Reply 3 on: Yesterday
Gracias!

 

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