I believe that pacing refers to the speed at which the speaker pronounces words and phrases, basically the speed at which somebody talks.
"Mine"
Mine is used when someone is claiming his/hers possessions.
However makes the most sense for the context. C) However.
Genetic inheritance is the best term to define physical and behavioural traits passed from parents to their descendents.
It was written in reaction to the German army's swift invasion of France in the Franco-Prussian war which was in 1870 until 1871.
I hope that's help:)
