An author's tone does not show bias towards a subject.

The answer is: one is an author's attitude toward the subject he/she is writing about. In order ... A candidate for Congress says his opponent voted “no” on a bill to increase financial ... Others, however, will use the language to show their opinion on the topic.

Explanation:

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recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation:

if flooding were to go unchecked, steel support beams in buildings would rust.