Answer: c) history
Explanation:
According to the question, major issue of history can be seen in research of Ron as power saw's noise can impact response rather than independent variable.Thus, series of past event that took place before in experiment can get disturbed through noise and produce incorrect or influenced outcomes.
Other options are incorrect because selection, testing and instrumentation are not the major issue of the scenario.Thus, the correct option is option(c).
It is bridged with anger and violence, american settlers came on to the Native Americans land and stole it from them.
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Over the last century, america's population has become more elderly and less young since the founding.
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These lines are called latitude lines which go around the earth horizontally
Answer:
D
Explanation:
Obese humans already have high levels of circulating leptin
Leptin is a hormone secreted from fat cells that helps to regulate body weight. But in obese people they have unusually high levels of leptin. This is because in some obese people, the brain does not respond to leptin, so they keep eating despite adequate (or excessive) fat stores, a concept known as ‘leptin resistance’. This causes the fat cells to produce even more leptin.
