Definition: This is a radioactive isotope, with a half-life of 5730, that is used to determine the age of carbon-based life forms up to about 60,000 years old.

b would be the right answer

thymine. in rna, thymine is replace by uracil

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.