Hard water contains excessive amounts of ________. A) fluoride ...

[jwb375]

Hard water contains excessive amounts of ________.
 
  A) fluoride ions
  B) calcium ions
  C) water ions
  D) magnesium ions
  E) Two of the above are the most appropriate answers.

Question 2

What is a similarity between pesticides and medical drugs?
 
  A) They need to selectively target the invader but not harm the host.
  B) They have to have a minimum amount of side effects.
  C) They should be readily decomposed into non-harmful byproducts.
  D) all of the above
  E) only A and B

[momo1250]

Answer to Question 1

E

Answer to Question 2

D

[jwb375]

Excellent

[billybob123]

Gracias!