The variable is independent because you are affecting it by changing it individually. It would be dependent if you changed one variable then the water was affected.
It will show spatial summation.
Answer:
Which of the following factors contributes to the distribution of biodiversity on Earth?
Inter-species interaction contribute greatly to the distribution of biodiversity on earth as it gives room for migration which helps to increase biodiversity
Explanation:
B. An ecosystem in which plant roots are submerged during parts of the years
