Select the correct statement from the following:
| 1. | Darwin variations are small and directionless |
| 2. | fitness is the end result of the ability to adapt and gets selected by nature |
| 3. | all mammals except whales and have seven cervical vertebrae |
| 4. | Mutations are random and directional |
Darwin got the idea of ‘common descent with modification’ as evolution initially from his observations on:
1. geographic distribution of species
2. fossil records
3. comparative embryology
4. comparative biochemistry