#5-2 "SWIMMING" IN THE POOL

Darwin's theory of fitness comes into play here. Only the strongest will survive. Things change over time but their fitness is how healthy their gene pool is. If their genes are not strong and healthy they will not reproduce healthy offspring and eventually their species could die off. They are saying that human activities are the bottom line cases for endangering animals. I didnt understand exactly what they meant until I read about domestic animals transmitting diseases to wild animals and the domestic animals are vaccinated against it so they are only carriers. One disease could wipe out an entire population and that is a concern.