If you have an organic sample of C - 14 weighing 220g, how long will it take to be reduced to 55g of C-14? Show all the calculations you will use.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.