Why so much emphasis upon units? Why are units considered to be ...

[future617RT]

Why so much emphasis upon units? Why are units considered to be as important as the quantity, magnitude, of something?
 
  What will be an ideal response?

Question 2

The possibility of life in a Europan ocean probably rests on the question of
 
  A) whether there is enough energy in a useful form to support biology
  B) whether there is enough water present
  C) whether there is enough raw materials to build biological molecules
  D) the level of salinity present

[juiceman1987]

Answer to Question 1

Just knowing the magnitude of something is not complete information (in fact it is ambiguous) unless one also knows the units. For example, learning that you will earn 150 for a certain task might mean 150 dollars, or perhaps 150 cents, or 150 pesos. The magnitude is almost worthless without the unit in which it is expressed.

Answer to Question 2

A

[future617RT]

Excellent

[xiaomengxian]

Great answer, keep it coming