How is half-life most likely used with respect to this fossil? to find the mass of the fossil to find the age of the fossil to determine the species shown by the fossil to determine if radiation is being emitted from the fossil

To find the age of the fossil

Step-by-step explanation:

You measure the intensity of the radiation (counts per minute) from a given mass of the sample.

If you know the half-life of the radioactive isotope (e. g., carbon-14), you can work backwards and calculate the number of years since the organism died.

A is wrong. You use a balance to determine the mass of the fossil.

C is wrong. The level of radiation tells you nothing about the species of the fossil.

D is wrong. You use a radiation detector to determine if a fossil is radioactive.

That would be to find the age of the fossil. Its called radiometric dating.