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Author Question: When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over ... (Read 21 times)

james0929

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on: Aug 27, 2018
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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Reply #1 on: Aug 27, 2018
Answer to Question 1

D

Answer to Question 2

D


james0929

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Reply 2 on: Aug 27, 2018
Great answer, keep it coming :)

31809pancho

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Reply 3 on: Yesterday
Wow, this really help

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