1)how does scientist use radioactive dating to determine how old a fossil is?
2)explain how radioactive dating of fossil can us know how old the continents are, or how long the earth has had life on it?

the answer is B

Explanation:

i got mine right when i did mine

Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms.

Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

the answer is b ) square root of 5

because growing process had stoped after 4-5 year