Nelson-Denny Practice Test 2025 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

What is a common term for a toxic substance?

Placid

Virulent

The term "virulent" describes a substance that is capable of causing disease or is extremely harmful and toxic. In the context of toxic substances, it often refers to an agent that can cause severe illness or has a harmful effect on health. This term is frequently used in medical and scientific discussions when addressing pathogens or chemicals that can have damaging effects on living organisms.

In contrast, "placid" refers to a calm and peaceful condition, "lethargic" describes a state of sluggishness or lack of energy, and "vivid" typically pertains to something that is bright, intense, or lifelike. None of these terms convey the idea of toxicity or harm in the same way that "virulent" does, making it the most accurate choice in this context.

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Lethargic

Vivid

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