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Author Question: What are the major natural sources of phosphorus used by plants? A) It is extracted from rocks as ... (Read 60 times)

anjilletteb

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on: Aug 27, 2018
What are the major natural sources of phosphorus used by plants?
 
  A) It is extracted from rocks as phosphate anion.
  B) It is formed by atmospheric reaction of phosphorus and oxygen during lightning strikes.
  C) It is converted from elemental phosphorus by specialized bacteria in the roots of plants.
  D) all of the above
  E) only A and B

Question 2

Why is the carbon-14 dating not accurate for estimating the age of materials more than 50,000 years old?
 
  A) This form of radioactive dating is only accurate back 1,400 years.
  B) The concentration of carbon-14 in a body after 50,000 years is too low.
  C) Living organisms are too decomposed after 50,000 years.
  D) Actually, carbon-14 dating is accurate back to around 5 million years ago.


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aruss1303

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

A

Answer to Question 2

B


anjilletteb

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Reply #2 on: Aug 27, 2018
Both answers were spot on, thank you once again


aruss1303

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Reply #3 on: Aug 27, 2018
Great! Please up vote :D


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