The continental drift refers to the separation process of Earth's surface in millions of years that happened due to the slow movements in tectonic plates inside the earth. So the answers are
It causes climate change which puts selective pressure on organisms
it causes changes in habitats, such as when large amounts of shallow marine habitat were lost in the formation of Pangaea
it may cause an increase or decrease in competition among different species
it happens so slowly that it does not affect living organisms
