Salmonella is a strain of bacteria that lives in the intestines of birds, humans and animals. These bacteria can contaminate raw food and water because of feces released by these organisms. During the egg formation, the Salmonella bacteria is transferred inside the egg before the egg is covered by the external hard shell in birds. The eggs can also be contaminated externally due to release of feces by these birds.
Therefore, it is required to boil the eggs before they are consumed to kill these bacteria. Hence, consuming eggs that aren't cooked enough can lead to infection with Salmonella.
The molecular clock is a scientific technique which presents a means of estimating evolutionary rates and timescales using genetic data. It uses mutation rate of biomolecules when two or more life forms diverged to estimate the time. Answer is B.
Hypothesis If the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.
