Which of the following is richest in fossil?

Give differences : Homologous structure and Analogous structure
 

How do we compute the age of a fossil ?

Fossils are .........

Which of the following are the wrong statements

$I.$ Organs which are different in basic structure and origin but performs similar functions are called analogous organ

$II.$ Organs with different to basic structure and origin but perform similar functions are called homologous organs

$III.$ Homologous organs lead to convergent evolution

$IV.$ Analogous organ leads to divergent evolution

The correct combination is