evidence for evolution (8.2)

Question 1

evidence 1: paleontology, fossils- definition & more on fossils

Answer 1

fossils are any remains of an organism or evidence of its presence.
-only organisms that die in low oxygen locations will fossilize
-fossils appear in chronological order
ex: for vertebrates, fish appear first followed by amphibians, reptles, birds and mammals
-the deeper the fossils, the simpler the life form

Question 2

how fossils are dated: radiometric dating

Answer 2

-radioisotopes are atoms that undergo radioactive decay
-each radioisotope has a constant rate of decay= half life