Final answer:
Oil spillage from drilling rigs causes significant harm to marine life by covering the ocean surface, blocking light and oxygen, and impairing the mobility of wildlife, leading to the death of phytoplankton and other marine organisms.
Step-by-step explanation:
Oil spillage from drilling rigs leads to the death of marine life. Oil spills cover the surface of the ocean, greatly reducing the amount of light and oxygen that can penetrate the water. This can severely impact marine ecosystems, causing the death of phytoplankton, which are crucial for the food chain and oxygen production in marine environments. Additionally, the presence of oil can limit the mobility of marine animals, resulting in their death. Some cleanup methods, such as the use of chemicals and bioremediation, can help address oil spills and mitigate their impact on marine life.