What is one of the main mechanisms of evolution?

What condition must be true for natural selection to cause a population to change over generations?

What is the difference between a gene pool and gene flow?

What is the connection between reproductive isolation and speciation?

Which pattern of natural selection favors the extreme phenotypes in a population, and is therefore more likely to lead to speciation?

What do we call the kind of evolution that occurs when organisms evolve to have similar phenotypes due to environmental pressure, rather than from being closely related?

What do we call the random change in allele frequencies that occurs in small populations?

What causes biological resistance? For example, what allows bacteria to become resistant to antibiotics?

What are the major evidences for evolution?