Answer :
Gunpowder developed in the 9 th century
Steak developed in 4 th century B.C
Small pox developed in 3rd century BCE
Written language developed in 3100 BC
The wheel developed in 3500 BC
Steak developed in 4 th century B.C
Small pox developed in 3rd century BCE
Written language developed in 3100 BC
The wheel developed in 3500 BC