Convert 150 g/L to the unit g/mL.

A. 15,000 g/mL

B. 15 g/mL

C. 0.15 g/mL

D. 0.0015 g/mL

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Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/4.00 of the original amount. How long ago was this plant alive?

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