Answer:
The spill affected 70,000 sq mi (180,000 km 2) of the ocean.
Explanation:
Area: 2,500 to 68,000 sq mi (6,500 to 176,100 km²)
They are dangerous to the environment because they have no natural competition. That being said they have nothing to keep their population in check, therefore, taking away food, and habits from all the other species. Thus, causing species to die out, which in turn ruins the food chain.
