Read this excerpt from White Fang. Furthermore, it was remarkably easy to overthrow a dog taken by surprise; while a dog, thus overthrown, invariably exposed for a moment the soft underside of its neck—the vulnerable point at which to strike for its life. White Fang knew this point. It was a knowledge bequeathed to him directly from the hunting generation of wolves. So it was that White Fang's method, when he took the offensive, was: first, to find a young dog alone; second, to surprise it and knock it off its feet; and third, to drive in with his teeth at the soft throat.

Which best describes the force that influences White Fang’s fighting method?

an external force based on setting
an external force based on authority
an internal force based on feelings
an internal force based on instinct

Which line in the passage can be used as textual evidence to support the following claim? many people suffer from depression. depression is a serious mental illness that affects a person physically and mentally. it interferes with a person's ability to function normally and enjoy pleasurable activities. some types of depression include major depressive disorder, seasonal affective disorder, and postpartum depression. many people confuse depression with general sadness, though people are becoming increasingly aware that it is indeed a serious illness. often people suffering from depression think that it is an incurable condition. they don’t seek any treatment because they are afraid of how others will judge them. based on data from the national institute of medical health, depressive disorders are common and affect 9.5 percent of adults in the united states, or about 19 million people every year. more than 80 percent of people with depressive disorders improve when they receive appropriate treatment.