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.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.