How would you date a sample of rock that you suspect as being one of the earliest on earth?
a. use a radioactive isotope with a short half life
b. use a radioactive isotope with a long half life
c. use an index fossil
d. use a microfossil

"Use a radioactive isotope with a long half life" is the way you would date a sample of rock that you suspect as being one of the earliest on Earth. The correct option among all the options that are given in the question is the second option or option "b". I hope that the answer has come to your help.

Mexico has a host of environmental problems, including significant chemicalpollution  from factory discharges and waste dumping, but the main threat to itsbiodiversity  probably stems from  deforestation  and other natural habitat losses. forest habitat is lost for a number of reasons