An anthropologist finds there is so little carbon-14 remaining in a prehistoric bone that instruments cannot measure it. this means there is less than 0.2% of the amount of carbon-14 the bones would have contained when the person was alive. how long ago did the person die? (the constant for carbon-14 is 0.00012.)
answer
13,411 years
22,491 years
45,020 years
51,788 years

The person died 51,788 years ago.

Explanation:

Let the initial amount of carbon-14 in the body when person was alive =

Amount of carbon-14 left after t years =

t = time elapsed

Decay constant of carbon-14=

t = 51,788.40 years ≈ 51,788 years

Since the carbon-14 in less than 0.02 % in the body which means the person must have died 51,788  years ago.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

elements make up everything, and they combine to make compounds.

the answer is c