Heat is the flow of thermal energy from one object to another.
They were the founders of democracy and they held meatings to vote for things and thats where we get the elections from
The second sentence, "The science director's assistant placed the order yesterday afternoon," is written in active voice.
The main difference between the newer and older stone age was that in the newer one, crop growing and domestication of different types of animals was becoming more and more common in different villages or societies. This was not the case in the older stone age.
