GEOLOGY

Detailed explanation-1: -Measuring carbon-14 levels in human tissue could help forensic scientists determine age and year of death in cases involving unidentified human remains. Archaeologists have long used carbon-14 dating (also known as radiocarbon dating) to estimate the age of certain objects.

Detailed explanation-2: -After an organism dies, its level of carbon-14 gradually declines at a predictable pace, with a half-life of about 5, 730 years. Archaeologists precisely measure levels of the isotope in organic remains.

Detailed explanation-3: -It turns out to be radioactive and decays over time. All organic material has decaying Carbon-14 in it. However, plants and animals that are still alive constantly replace the supply of carbon in their systems and so the amount of Carbon-14 in the system stays almost constant.

Detailed explanation-4: -Once the organism dies, it stops replenishing its carbon supply, and the total carbon-14 content in the organism slowly disappears. Scientists can determine how long ago an organism died by measuring how much carbon-14 is left relative to the carbon-12.

Detailed explanation-5: -C-14 decays with a half-life of 5, 730 years.