Better construction, lighter materials, repeating cartridges (vs. muzzleloading)
they have changed from stone age eg. spears, flint or sharp stone to things like the atom bomb or machine guns They evolved through intelligence and trial and err. Metals were discovered and shaped into swifter, more usable weapons.
the machine guns
Gatling guns evolved into machine guns prior to WWII.
they have changed by not using spears for hunting they use guns
It depends upon how man himself has changed or evolved with the last three centuries or how the earth itself has changed and evolved over the last 600,000,000 years.
because it got changed and Nerf guns were really blue in the first place
change, adapt
Yes
See answer below.
by having wars
guns have changed-google guns from times like the ok corral time-period and then google now-aday guns. guns have gotten faster, and more powerful. they have changed in apearence, and, some say, quality. The first guns were cannons. They were shrunk down into hand-cannons later, but they were almost useless. They then developed matchlock and flintlock rifles, which were much better.
They have evolved. There entire structure has changed, like their skeleton and their appearance.