Your Friend Tells You That Some of the Carbon Atoms

Multiple Choice

Your friend tells you that some of the carbon atoms in his body were previously part of another living organism. This is

A) possible only if he is a cannibal.
B) possible since carbon cycles through the ecosystem.
C) impossible since carbon can't enter a living system more than once.
D) highly unlikely since carbon does not cycle like other elements.
E) unlikely because we don't have any carbon atoms in our bodies.