<span>Speaker of the House is the answer you're looking for. Hope I helped!</span>
Answer:
During the Agriculture revolution, people found it easy to domesticate pigs. Pigs were a source of food, and breaded them to obtain more pigs. I hope this helps :)
The reason why it's opened to interpretations is that we don't know everything about it, and crucially, we don't know people's intentions and thoughts. This we only know from interpretations, but as we learn more about the past, our interpretations change.