If there was a large-scale oil spill near these islands, what ecological problem might occur? The price of oil and gasoline might become expensive.
Clean water will become more expensive for people in on the islands.
Residents might be unhappy with the dirty water.
Plants and animals in the surrounding waters may be harmed.

Clean water will become more expensive for people in on the islands.

Explanation:

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;