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Author Question: Which substance strengthens tooth enamel? A) fluoride B) abrasive C) plaque D) ... (Read 73 times)

Tirant22

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on: Aug 27, 2018
Which substance strengthens tooth enamel?
 
  A) fluoride
  B) abrasive
  C) plaque
  D) protein

Question 2

To make crude petroleum more useful, it must be
 
  A) distilled.
  B) filtered.
  C) reduced.
  D) washed with water.


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jsm54321

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

A

Answer to Question 2

A


Tirant22

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Reply 2 on: Aug 27, 2018
Gracias!

Jsherida

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Reply 3 on: Yesterday
:D TYSM

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