Science and technology are major reasons why the human population is growing so rapidly. Advances in agricultural technology have allowed efficient production of crops and other foods. More food supports more people. As a result, the human population has begun to grow faster. Medical advances have also allowed the human population to increase. Vaccines have lowered the death rate. More children are surviving to adulthood. Other medical advances have allowed adults to live longer lives.One of the most common interactions in communities is that between predators and their prey. Predation is the act of one organism killing another for food.Species that involve predator-prey or parasite-host relationships often develop adaptations in response to one another. For example, predators evolve to be more cunning to catch their prey. In response, prey evolve to be faster runners to escape more easily. Back-and-forth evolutionary adjustment between two species that interact is called coevolution.
