Name the type of isolation mechanism that is operating: Bullfrog males will try to mate with just about anything, including rocks (this is true), but when they fertilize the eggs of tree-frog females, the developing tadpoles die before they reach adulthood.

MCQs on how organisms evolve over time, with particular emphasis on natural selection, evolution, speciation, phylogeny and taxonomy, and aspects of genetics and inheritance. As well as the study of population ecology and ecosystems.