Final answer:
Steroids are organic compounds including hormones used in medicine, while contamination refers to the presence of undesired substances causing impurity. Peripheral Vascular Disease (PVD) affects blood flow outside the heart and brain.
Step-by-step explanation:
When discussing the term Steroids, one might say that steroids are a class of organic compounds with a characteristic molecular structure that includes four rings of carbon atoms; they can include hormones and are often used in medicine to treat inflammation.
The term Contamination refers to the presence of an unwanted substance that makes something impure or hazardous; for instance, contamination in water supply can lead to serious health issues.
Peripheral Vascular Disease (PVD) is a condition that affects the blood vessels outside the heart and brain, often leading to reduced blood flow to the limbs, which can cause pain and difficulty walking.