Question

In a comprehensive study assessing the impact of chemicals on organisms, which term refers to the concentration of a toxicant in the surrounding environment, causing mortality in half the percentage of a genetically homogeneous test population?

A Lethal Dose 50 (LD50)
B Lethal Concentration 50 (LC50)
C Toxicity Threshold Level (TTL)
D Concentrated Lethal Exposure (CLE)
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