Dendrochronology is a method of dating by using tree rings.
radiocarbon.
calendar age.
correlated age.

this is some false statement. aliens aren't real.

hope this .

urban people were mostly involved in jobs that required phyisical labor they are paid daily wages (minimum wages) from which they evoke their living. daily wages also mean that the day they don't turn up for work ,even due to sickness, they aren't paid anything.