Answer:
The physical features contributed to the settlements because they were able to create/make sailboat and the wheel.
Explanation:
they did this because it was a land between two rivers that where tigris and euphrates.
I looked it but I was debating on C or D but I’m thinking it’s C because google was saying the National forest magages timber, wildlife, removing small trees. C says ecosystem which is the environment.
Science, if its not that, its engineering