Buddhism started out as a educational system and not a religion.
Now Buddhism has alot of different branches and many idols have been implanted into it
Buddha said not to pray to him because he was not able to hear prayers he was not a god.
In Buddhism today people think buddha is like a god and they pray to him and bow down to him.
Also, Buddhists are not supposed to eat meat because they believe the animal might be a temporary home of a human spirit. But now, buddhists do eat meat of fish and other animals.
In order to answer this, we would have to know what the 5 time periods to which you refer.
Which country? Buddhism is over 2,500 years old and has spread to all continents over that time.
how the anemometer changed over time
The laws of physics have not changed over time. Our understanding of them has changed over time.
how has coal mining changed over time
People changed over time by growing up.
no they have changed over time. no they have changed over time.
how has neils bohr model changed over time
You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism
well it has changed over time bye people dancing it different styles.
Over time Buddhism became widely practiced after the Han Dynasty fell.
how the seismograph change over time