1) A thin oil film prevents gas exchange between water and the atmosphere,
2) due to oxygen starvation, all inhabitants of the reservoir, especially those living on the surface, suffer
(or, causes the death of plankton, and other organisms living in the water column;
or, plankton – the main food product of marine inhabitants ceases to multiply;
3) Covering the feathers of waterfowl, it impedes flight, the birds die.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.