The dependent variable is that she bites her nails. Being nervous is an independent variable due to that it doesn't depend on anything said. However, in order for her to bite her nails, she has to be nervous as stated.
Brutus believes that if they do not move toward Philippi, they will be trapped and defeated at Sardis.
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Current day engineers and now very educated and advanced. But technology advances everyday as well so they have to keep up. There are new machines in their work that they have to use. So they have to learn to generate the machines often.
