B. it has more biodiversity
1. encating laws or voluentary agreements
2. working to keep enough attractive affordable houses
3.assuring that development is spread out fairly
4. make quality trasportation
Answer:
Testing only one Variable at a time lets you analyze the results of your experiment to see how much a single change affected the result. If you're testing two Variables at a time you won't be able to tell which Variable was responsible for the result.
Explanation: