Homologous organs are those which have:

The study of fossil evidences of evolution is called:

The wings of birds and the wings of insects are $.........$.

Choose the correct statements with reference to organic evolution.
$I.$ Flippers of whale and wings of bat exhibit analogy.
$II.$ Wings of butterfly and wings of bird exhibit homology.
$III.$ Organs with dissimilar structure are called analogous organs.
$IV.$ Organs with similar structure and origin are called homologous organs.

The embryological support for evolution was proposed by:

Homologous organs are ............. .