Define evolution as the progressive change in a population's inherited characteristics over time driven by natural selection.
State the evolutionary theory that all present-day species evolved from simple life forms over three billion years ago.
Explain the mechanism of natural selection, where variants with phenotypes best suited to their environment are more likely to survive and reproduce.
Describe the process of speciation, occurring when two populations become so phenotypically distinct that they can no longer interbreed to produce fertile offspring.
