The reverse of the respiration reaction is the reaction known as ...

[pragya sharda]

The reverse of the respiration reaction is the reaction known as
 
  A) combustion.
  B) oxidation.
  C) photo-synthesis.
  D) inhaling.
  E) exhaling.

Question 2

The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
 
  A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood.
  B) the ax-handle is about 18,000 years old.
  C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today.
  D) the ax-handle is about 12,000 years old.
  E) the ax-handle is about 48,000 years old.

[skipfourms123]

Answer to Question 1

C

Answer to Question 2

B

[pragya sharda]

Thanks for the timely response, appreciate it

[amit]

Gracias!