Question

which of the following is a technique of relative dating
a. beta decay
b. index fossil correlation
c. isotope ratios
d. radiocarbon dating

Answer 1

Relative dating is the science of determining the relative order of past events, without necessarily determining their absolute age.

So it's like saying this animal lived in the same period as this other animal, since they were found in the same rock layer.

Beta decay, isotope ratios and radiocarbon dating are all radiometric dating methods.

Answer 2

http://paleobiology.si.edu/geotime/main/foundation_dating2.html