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2. Quantitative Reasoning & Feedback
GED® Science: Full-Length Practice Exam (Level 3 - Expert) · preview lesson
Expert science blends biology, chemistry, and physics with numbers and systems.
- Calculate from formulas. Speed = distance / time; work = force x distance; density = mass / volume; acceleration = change in velocity / time.
- Energy through trophic levels. Only about 10% of energy passes up each level of a food chain.
- Negative feedback. The body senses a change and acts to reverse it -- as insulin lowers high blood sugar.
- Evaluate the evidence. A valid conclusion needs a control group, enough samples, and only one changed variable.
Quick Check
When insulin lowers blood sugar after a meal, returning it toward normal, what kind of control is that?
It is negative feedback -- the body reverses a change to restore balance.
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