Two things that made travel difficult for humans was a lack of natural speed and the lack of knowledge in correcting this. Once humans were able to ride animals and build vehicles, they become very efficient at travelling.
water and mountain
They travel by rockets
What are the two mountain ranges that made land difficult to travel?
by walking
plastic
the oceans
the wheel
the pyramids
life was difficult because they did not have most of the things we hav today
It was hard to cross the Appalachians and it made travel difficult and dangerous
Yes, it was it's geography made it difficult.
hunt for evideace in the ground and study things made by humans