Final answer:
Chemical A with an LD50 of 5mg/kg is more toxic than chemical B with an LD50 of 8mg/kg because a lower LD50 value signifies higher toxicity.
Step-by-step explanation:
The question asks whether chemical A with an LD50 of 5mg/kg or chemical B with an LD50 of 8mg/kg is more toxic.
The LD50 (lethal dose, 50%) is a measure of a substance's toxicity based on the dose required to kill half the members of a test population of animals. In this measure, a lower LD50 indicates a higher level of toxicity.
Therefore, chemical A with an LD50 of 5mg/kg is more toxic than chemical B with an LD50 of 8mg/kg because it takes a smaller dose of chemical A to reach the lethal threshold.
The complete question is: Is Chemical A with an LD50 of 5mg/kg more toxic than chemical B with an LD50 of 8mg/kg?