Which of the following best describes natural selection?
1. A tornado wipes out 95% of a beetle population and is repopulated with the remaining beetles;
2. Some wombats have longer nails, enabling them to obtain food more efficiently and survive;
3. An individual from a neighboring population of giraffes joins a new herd bringing in new genes;
4. A mutation in the fenetic code
causes some mice to produce a protein and have white fur