Question

there are ______ levels of acute toxicity.

a. ten

b. eight

c. three

d. four

Explanation:

In the field of toxicology (a subfield of Natural Science, specifically related to Medicine and Health or Environmental Sciences), the number of levels of acute toxicity is a known fact. Acute toxicity has four levels (e.g., slight, moderate, severe, and lethal or other standard classifications that sum to four).

Answer:

d. four