Independent variable represent the variable
Answer - Fewer Species or Little of life
Reasoning - Usually in an island surrounded by water has little of life because the limited resources but also if there were to be species living within the island it will be very little because of the resources they compete. Especially moving away from mainland since (No Humans) lol.
The first things that should be done would be to ensure that you yourself are aware of the hazardous materials that are present, protect yourself, and call for personnel. Hope this helps!