Ammonites are fossil shell remains of

Which one provides direct and solid evidence in favour of organic evolution through ages?

The occurrence of vestigial organs is not explained by:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Forelimbs of humans and bats are homologous.
Reason $R$: Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below:

$A$ good example for recapitulation theory is

What is the study of fossils called?