Salamanders are the only vertebrate capable of regenerating lost limbs
Indicate whether the statement is true or false
TRUE
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Why is it important to include a placebo in a scientific study to assess the effectiveness of a drug?
A. It's actually unethical to do so-if you have a drug that you know to be effective, it's unethical to withhold that treatment from an ill patient. B. A placebo-treated group will determine if the changes observed in the drug-treated illness group are due to a psychological effect rather than a physiologic/pharmacologic one. C. It isn't scientifically important-a placebo simply helps investigators satisfy the legal requirements of the Food and Drug Administration in their testing process. D. A placebo-treated group will determine if the changes observed in the illness in this non-treated group are due to a physiologic/pharmacologic effect rather than a psychological one.
No asteroids have orbits that cross the Earth's orbit
a. True b. False Indicate whether the statement is true or false
The principle of comparative advantage is associated with
a. restricting consumer choices. b. greater production at higher prices. c. specialization and exchange. d. comparing the efficiency of alternative tariffs.
Briefly explain why allergies, such as hay fever, are characterized as a hypersensitive immune
response. What will be an ideal response?