Question

change in the fossil record
isotope | half - life | used for
uranium - 238 | 4.47 billion years | geological dating
uranium - 235 | 704 million years | geological dating
carbon - 14 | 5730 years |
fluorine - 18 | 109.77 minutes | pet imaging
yttrium - 90 | 2.67 days | radiotherapy
one way to estimate the age of a fossil is
select
select
punctuated equilibrium.
carbon dating.
stasis.
cladograms.

Explanation:

Carbon-14 has a half-life of 5730 years, which is suitable for dating fossils (organic remains) that are tens of thousands of years old, matching the context of estimating fossil age. The other options are unrelated: punctuated equilibrium is an evolutionary theory, stasis refers to no evolutionary change, and cladograms are diagrams showing evolutionary relationships.

Answer:

carbon dating.