Evidence of Evolution
Four Pieces of Evidence
1. ________________ ____________________________ of organisms that lived in the past
There are TWO ways to determine the age of a fossil……
* ___________________________ describes if a fossil is _______________ or
___________________ than another fossil
Fossils found in ________________ layers of ______________________ rock
are OLDER than fossils found in layers of rock ___________________ them.
* ___________________________ gives a specific __________ for a fossil
Uses the __________________ of certain atoms (carbon & uranium) that
made up the organism to determine its age.
If there is 50% of the parent isotope and 50% of
the daughter isotope, how may half lives have
passed?
If the half life of carbon 14 is 5000 years, how
old is a fossil that is 25% of the parent isotope
and 75% of the daughter isotope?
2. ___________________ structure of an organism
* ____________________________________have
the SAME structure & origin but DIFFERENT function
____________________________________
3. ________________________ study of ___________________/ molecules that make up living organisms
Ex. ____________________________________
* Scientists believe that the more _____________________
organisms have, the more _________________________
they are
* Over _________ of the DNA in chimpanzees and humans
is the __________________.
4. _________________________ study of _______________________
* Scientists believe that the longer the embryos look _________________ during development, the more
________________________________.