In toxicology studies, LD50 can be best described as the dose ________
A) at which 50% of an exposed population develops a chronic effect from the toxicant
B) at which 50% of an exposed population develops disease
C) at which more than 50% of the population dies as a result of the toxicant development
D) at which 50% of an exposed population is killed or displays a specific symptom
E) at which at least 50% of the exposed population is not affected by the toxicant
Answer: D
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Which of the following statements about recurrence intervals is correct?
Which of the following statements about recurrence intervals is correct? The shorter the recurrence interval the smaller the earthquake. The longer the recurrence interval the smaller the earthquake. The shorter the recurrence interval the larger the earthquake.
What societies have birthrates of 40 births per thousand people?
A) agrarian B) industrial C) post-industrial D) technological E) none of the above
Which species is known to be threatened or endangered with premature extinction largely because of human activities?
A. Turkey vulture B. Gray wolf C. Mule deer D. Grizzly bear E. Red fox
Make a simple sketch of an atom and label its three main particles. Explain how these particles differ from one another
What will be an ideal response?