Question

why are fossils considered important in the study of evolution explain two ways by which age of fossils can be estimated

Answer 1

while digging the earth and start to find fossils fossils present at more deep are having more age.
by finding the ratios of isotopes of the same element present in the fossil

Answer 2

Fossils provide evidence in favour of evolution. They establish evolutionary relationship by providing missing links.

Age of fossils can be determined by the folloeing ways :-

1. Relative method

Fossils found closer to the surface are more recent than those in depperlayer.

2. By detecting the ratios of different isotopes of the same element in the fossils material.