The answer would be ecosystem.
- I hope this helps! (:
D is the answer to the question
Answer:
go to school and learn somethinggg ,listen to your teacher and you will soon,
If the gradient or slope is high then the water flow will go faster because suppose water is flowing down from a skateboard ramp, it would flow faster than water flowing throw a straight pipe.
Here's a picture I drew to help you!
I believe the answer is c