million years. But theydied out long before the development of the modern large animals we know of today. The earliest types of humans first existed about 5 or 6 million years ago.
Dinosaurs
the "Spinosaurus" were larger than elephants, and some could run faster than a human being. Scientists say that some dinosaurs like the "Velociraptor" hunted in packs like today's wolves and lions do.
buy" or "trade for“ things they wanted. This is known as a barter system, a form of trade where some goods are exchanged for other goods.
introduce the use of gold and silver coins around 650 BC. Gold and silver are still quite valuable today.
Lydians coin Chinese banknotes Chinese banknotes
weigh怎么读

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。