Fallout contamination, a serious environmental issue in the Pacific Islands, happens as a result of
A. the destruction of the coral reef
B. the effects of climate change
the introduction of exotic species
the testing of nuclear weapons

nuclear weapons i think

Explanation:

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

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.