The half-life for DNA decay is 521 years. What does it mean?

A. Half of the organisms used to live for 521 years.

B. Scientists can only find DNA for the last 1042 years.

C. Half the DNA bonds breakdown over 521 years.

D. Scientists can only study organisms that lived 521 years ago or longer.

i think it should be C.

Explanation:

But a study published this week (October 10) in the Proceedings of the Royal Society B estimates that DNA from bone has a half-life of 521 years: after that amount of time, half of the nucleotide bonds that hold it together are broken, and after another 521 years, those bonds are cut in half again, and so on.

answer; a muscle cell, another neuron and a of the above

it creates acid rain