Species can adapt to changes in their environment through the process of natural selection. These changes can be so significant that the organisms can be said to be a new species. All life on Earth originated from a single common ancestor and the huge variety of species on Earth today exists as a consequence of evolution through natural selection.
|2||Isolation and speciation|
|3||Mass extinctions and the sixth mass extinctions|
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“Discuss evidence that suggests we are in a sixth mass extinction.” [9 marks]
The essay should marked using the Paper 2, Section B essay markbands.