Answer:
Historians use manuscripts, carvings, pillars, other types of utensils and jwellerys. They examine the archeological sites the soil etc, to find the specific ages of them. They also used preserved documents to write it.
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You have to put words that have the same root word as those words
For example:
Floral, florero, florista, floristería
(Flowery, flower vase, florist, florist)
The root word is flor (flower)
Or
Coloridos, colorear, tricolor
(Colorful, color, tricolor)
The root word is color
I hope you can understand my explanation, it can be very complicated :)