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The LD 50 is a number scientists use in research to determine the dose of a toxin required to kill 50% of a population of organisms. Biologists in Louisiana have become concerned about cadmium levels in the water near New Orleans, and the chance that frogs will die out.

Scientists have performed an experiment on bullfrog tadpoles In Louisiana and the results are presented in the graph. The LD 50 for bullfrogs is reached

A) at about 6 mg per gallon per day.

B) at about 60% of surviving tadpoles.

C) somewhere around 11 mg per gallon per day.

D) somewhere between 2 mg and 3 mg per gallon per day.

The LD 50 is a number scientists use in research to determine the dose of a toxin required to kill 50 of a population of organisms Biologists in Louisiana have class=

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The answer is A.

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The correct answer is option A) at about 6 mg per gallon per day.

The LD 50 (Lethal dose) is the amount of the toxin required to kill the 50% members of the population. The graph attached in the question depicts that at around 6mg of cadmium per gallon per day, the number of the tadpoles is around 50% of the total population of the tadpoles. Hence, the LD 50 in this case would be 6mg of cadmium per gallon per day.