As the number of yeast in an area increases over time, more alcohol accumulates, causing death rates of the yeast to rise. This is an example of:
a) exponential growth
b) density independent regulation of population sizes
c) territoriality influencing population sizes
d) density dependent regulation of population sizes

The sinking of the Cunard ocean liner RMS Lusitania happened on Friday, 7 May 1915 throughout the First World War, as Germany conducted fighting in contradiction of the United Kingdom which had applied a naval barrier of Germany. The ship was recognized and ruined by the German U-boat U-20 and go under in 18 minutes. The vessel went down 11 miles off Ireland, slaying 1,198 and having 761 survivors.