Speciation & evolution

state the general theory of evolution that organisms have changed over time
discuss the molecular evidence that reveals similarities between closely related organisms with reference to mitochondrial DNA and protein sequence data
explain how speciation may occur as a result of geographical separation (allopatric speciation), and ecological and behavioural separation (sympatric speciation)
explain the role of pre-zygotic and post-zygotic isolating mechanisms in the evolution of new species
explain why organisms become extinct, with reference to climate change, competition, habitat loss and killing by humans