Question

Which pair of elements can be used to determine the age of a fossil that is over one billion years old?

A.lead, which is radioactive, and uranium, which is stable

B.carbon, which is radioactive, and nitrogen, which is stable

C.argon, which is radioactive, and lead, which is stable

D.potassium, which is radioactive, and argon, which is stable

Answer 1

A

Step-by-step explanation

It should be A., lead and uranium.

Answer 2

D sorry if I’m wrong