Use a graph to illustrate your answer. There is also some evidence that the human population may be growing beyond sustainable limits. List the resources that you feel are currently overused or appear to be close to overuse and explain why. Biological magnification has serious consequences not just for the species it hurts directly, such as predatory birds, but for other species in a community as well. Consider the food web in Figure 30-5 in your text book.
Some animals can reproduce either asexually or sexually, depending on the state of the environment.
Most biologists feel that natural selection only acts on individuals, but a few biologists argue that selection can act on a population or a group.