It helps determine the absolute ages of rocks
The age of rocks can be determined by radioactive dating.
It helps determine the absolute ages of rocks
Bone Scan
age
Optical testing with polarizing filters will enable you to determine the original crystal system of a transparent polished gem.
age
by comparing its placement with that of fossils in other layers of rock
semicircular canals.
en.wikipedia.org/wiki/Spectroscopy
They determine your sex and enable reproduction, hence keeping your species alive :)
semicircular canals.
Dating introduction services are available for Christians who are single to enable them to meet like minded people. Christian Mingle is an online Christian dating service. Alternately dioceses sometimes organised social events or holidays to enable single Christians to meet each other.