The answer is functional group.
A functional group is a collection of organisms, that share alike characteristics in a particular community. Idealy, this lifeforms would perform equivalent tasks based on domain forces, rather then a common ancestor or some evolutionary relationship.
Answer: The animals lived in those regions millions of years ago before the continents split.
Explanation:
When they split the fossils in one area that were identical to the ones in another ended up in another. Or Aliens I dont know that's the best i got
The discomfort is caused by the change(difference) in pressure between ground level and the top of the mountain.
The continent name is Africa
Answer:
These areas had the most resources.
Explanation:
When you are settled by rivers, you have the sources you need to grow crops, raise life such as cows, pig, chicken. Not only this but you also have a place to bath, collect drinking water, and wash clothing. Life thrives more on river sides rather than inland during these times as they did not have all the tech we do today.