After the potato famine of 1845 many irish left for other countries while those who stayed demanded

Food from the British (because they were getting plenty of imports)

i think the answer is the one about environmental and social health.

hope this

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.