If scientists examine a bone fragment of a wooly mammoth and find that the percentage of Carbon 14 is 12.5 percent of the amount that would have been present at death, how many half-lives will have passed and approximately how old is the bone fragment?

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

the answer is c.) there is a warm front in region a and a stationary front in region b.