Radioactive isotopes in fossils decay at a constant rate. the ratio of radioactive isotope to stable isotope can be examined to estimate the age of the fossil or the rock it was found in. this is an example of dating.
a. relative
b. precambrian
c. absolute
d. magnetic

The correct answer is option C, that is, absolute.

Explanation:

A method of dating in which the chronological age of the rock or the fossil can be predicted based upon the radioactive carbon dating is known as absolute dating. The radioactive carbon refers to the element that dissociates or degrades after the organism's death. The determination of the half-life can be done on the basis of the process of decay that can be associated with the age of proof.

thermophiles, notice the prefix thermo.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.