A.The Roman empire relied on physical features as natural barriers.
George Percy became leader after John Smith
Extraneous
An <em>extraneous variable</em> is a variable in an experiment that you are not intentionally studying. These variables usually provide undesired affects on the experiment.
In this example, the independent variable is whether a sentence is humorous or not, and the dependent variable is the memory performance score. However, because the humorous sentences are only given to males, and the non-humorous sentences are only given to females, gender becomes an extraneous variable as you are not intentionally testing gender's relation to the dependent variable, but it is still affecting the experiment.
Explanation:
Institutional leadership infuses values through establishing narratives that connect the past, present, and future, interpreting external values requirements by matching and connecting them with traditional operational identity, and guaranteeing their embodiment by supporting exploratory value dialogue processes.
