The age of a rock or fossil is obtained from radioactive dating.
The information about sequential order of the event occurred in the past can be obtained by using only relative dating method. Explanation: Relative dating method doesnt give information about when it happened. It provides sequential order of the events.
How does radioactive dating help in the study of evolution?
Radiometric dating. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. Afterwards, they decay at a predictable rate.