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 peppered moth (Biston betularia), the black-coloured form becomes dominant over the light-coloured form of moth in England during industrial revolution. This is an example of

What is true about the isolated small tribal populations?