6. the following atoms are all variations of the element carbon: 12c, 13c, and 14c due to differing
numbers of neutrons. what are these variations called?
a. isotopes
b. polynomials
c. polymers
d. isomers

check for the pregnancy rating of drug. if its class c or d see if other alternatives

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.