-The remains and relics of dead animals of the past are called as fossils.
-Fossil archaeopteryx process features of reptiles as well as birds. This suggests that bird have evolved from reptiles.
Age of fossils:-
- The age of the fossil is determined by the depth of the fossil.
-The second way of dating fossils is by detecting the ratios of different isotopes of the same element in the fossil material.
Shaalaa.com | Heredity and evolution part 12 (Evolution, variation)
Series: series 1