So uhm
what were the medival times and when were they?

In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the late 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance and the Age of Discovery.

Explanation:

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì

these include the fossil fuels, oil, natural gas, and coal and nuclear energy. hope this ! ^.^

-ella