B- It led to a period of large-scale emigration out of Ireland.
In Australia, the most populated region by natives was places like the outback and what is nowadays known as Alice springs. The New Zealand had a more or less equally spread population because of it's much smaller sides, but there was a bias towards the North where there were more people than in the South of the island.
One problem is by trading by sea, ships are bring invaise sea creatures to other countries and can harm the wild life for other marine ecosystems and for tons of people.
