In his most famous book On the Origin of Species, Darwin included four major arguments: that new species appear; that these new species have evolved from older species; that the evolution of species is the result of natural selection; and "that natural selection depends upon variations and the mai...

Evolution and Genetic Engineering Activity 1: Why is AIDS so difficult to cure? How does the AIDS virus attack the body? â In 1979, the first reported AIDS case occurred in New York, and by mid-June 1981, unusual immune system failure among gay men was surfacing in the United States. The...