An LD50 is a dose of a toxic chemical that
A. Is an acceptable level of risk for most individuals
B. Is 50 times less than the minimal dose
C. Kills half of the population
D. Kills individuals 50 years old and above
E. All individuals react to
Answer: C
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Which of the following gases absorbs most of the harmful ultraviolet radiation in the stratosphere?
A. nitrous oxide B. carbon dioxide C. ozone D. chlorofluorocarbons
Which model was developed to explain the opening and closing (creation and destruction) of ocean basins?
a. phylogeny b. parallel evolution c. endosymbiosis d. Grenville orogeny e. Wilson Cycle
Ethyl acetate is isomeric with which of the following compounds?
A) methyl propanoate B) propyl formate C) butanoic acid D) all of these
The present elevation of the Appalachian Mountains is due mainly to (Choose all that apply.)A) post-orogenic upliftB) breakup of PangaeaC) an orogeny during early Paleozoic timeD) the Wilson cycle
What will be an ideal response?