Radiocarbon dating is possible primarily because ____
A)the ratio of carbon-14 to carbon-12 in the atmosphere is constant
B)carbon-14 is constantly being formed in the upper atmosphere
C)living organisms selectively use carbon-13 and carbon-12
D)organisms stop accumulating carbon-14 when they die
E)carbon 14 decays to oxygen
D
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Arched folds where limbs dip away from the hinge line are called
A) inclines. B) anticlines. C) synclines. D) reclines.
Easter Island is the current home to about 4,000 people; tourism is all but nonexistent on the island as there are only a few visitors each year
Indicate whether the statement is true or false
In drowning victims, positive end-expiratory pressure is used to:
A) prevent atelectasis and force fluid from the alveoli. B) increase the rate and depth of the victim's breathing. C) force fluid from the interstitium back into the alveoli. D) increase cardiac contractility and improve stroke volume.
If someone says that an idea is "only a theory" and implies that this means it can be dismissed, is this a valid viewpoint?