Which is not a vestigial part in humans ? 

1. Segmental muscles of abdomen

2. Finger nails

3. Third molar

4. Coccyx

Peripatus is a connecting link between

1. Ctenophora and Platyhelminthes

2. Mollusca and Echinodermata

3. Annelida and Arthropoda

4. Coelenterata and Porifera

A baby has been born with a small tail. It is a case exhibiting

1. retrogressive evolution

2. mutation 

3. atavism

4. metamorphosis.