Carbon-14 dating is fairly reliable for dating once-living materials that died up to ________.
A) 5000 years ago
B) 50,00 years ago
C) 250.000 years ago
D) 2.5 million years ago
Question 2
Why is it easier for the body to excrete a polar molecule than it is to excrete a nonpolar molecule? What chemistry does the body use to get rid of molecules it no longer needs?
A) It is easier for the body to excrete non-polar molecules because they dissolve in the oils of the skin and are washed away when we bathe.
B) Polar molecules are easier to excrete because of their greater solubility in water. Upon dissolving in water, they can be excreted through urine.
C) Polarity of the molecules has nothing to do with the ease of excretion. However, the body does metabolize and excrete smaller molecules more easily and passes them out through the colon.
D) Polar and non-polar molecules are excreted equally easily. The body is well adapted to deal with both forms of molecules via its metabolic processes.
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