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Which phase of drug development looks for adverse effects before the drug is put on the market?

The drawing shows a rectangular block of glass (n = 1.52) surrounded by air. A ray of light starts out within the glass and travels toward point A, where some or all of it is reflected toward point B.  b. At what angle must the incident beam have originally struck the glass? (What is the original angle of incidence from outside the glass?)

EXTRA CREDIT:  A good lede: 

__________drugs initiate a cell response after binding; whereas __________ drugs do not because of incomplete binding.

When the combined effect of 2 drugs is less than either alone, this indicates a(n) __________ effect.

Which law speeds drug approval because of an eminent threat to public health?

A hobo on a train is playing a tuba, holding out an A (at 110 Hz). d) At what intensity level do you hear the stationary tuba?   Answer in dB.

Written correctly? Style, grammar, punctuation, spelling, etc. “It was fate,” he said, “we knew we’d catch him.”

AP STYLE: Mark true for correct, false for incorrect (None of these is at the beginning or end of a sentence.) Britney Spear’s CD

Written correctly? Style, grammar, punctuation, spelling, etc. Two million dollars is a lot of money, Scrooge told Tiny Tim.