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. molecules
b. isotopes
c. polymers
d. isomers

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a. control b. hypothesis c. procedure d. system

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities