Weapons have become more sophisticated and precise. Some of the most commonly used weapons today are guns which are quite different from swords and machetes used in olden times.
Need to specify a time period in order for this to be answered. Spain has been around for a very long time, and has seen many changes to its weapons inventory.
stuiped
The bulk of the USSR's weapons are now in the custody of Russia. The US is still around, and still has some of its weapons; others have been decommissioned and disposed of.
During which period? The British military has been around for a very long time, and has seen many changes to its standard weaponry.
they know because they can look at different changes in the object of study/story/subject in which they are studying and calculate what the changes are and how long these changes have taken place for/over what perid of time/ for how long/ when it changed and then find out what has been happening over that time period/ frame.
If an object's velocity changes over time, it is accelerating.
Changes in diversity over time.
Mutation can lead to genetic changes over time!
When an object changes position over time, the object is in motion.
Position-time graph: Shows how the object's position changes over time. Velocity-time graph: Indicates how the object's velocity changes over time. Acceleration-time graph: Illustrates how the object's acceleration changes over time. Displacement-time graph: Reflects how the object's displacement changes over time.
Age.
The weapons they used improved over time.