A Park Ranger at Shenandoah National Park Wants to Know

question 10

Multiple Choice

A park ranger at Shenandoah National park wants to know if visitors to our country's national parks can properly identify poison ivy. Over the course of a month, she shows several plant varieties to 30 randomly selected visitors per week, and 74 of them correctly identify the poison ivy. The biggest potential weakness of experiments is that:

• A) experiments do not give good evidence for cause and effect.
• B) experiments only work when one can give a placebo.
• C) it can be hard to generalize conclusions beyond the actual subjects to a wider population.
• D) informed consent is often not possible.

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Definitions:

Breast Cancer

A malignant tumor that develops from the breast cells, which can spread to other parts of the body if not treated early.

Uncontrolled Growth

Often refers to abnormal cell growth, such as in cancer, where cells divide and multiply in an unregulated manner.

Cancer Cells

Abnormal cells that divide uncontrollably, have the ability to infiltrate and destroy normal body tissue, and can spread to other parts of the body.

Mutations

Changes in the DNA sequence of an organism's genome, which can lead to variations in physical traits or an increase in susceptibility to certain diseases.