Well,
it is effecting sea creatures becasue once tiny creature can eat something toxic, and another animal eats it, it will carry the toxin on. This is called biomagnification. This is when a toxin of anysort, is carried on throught the food chain.
Anyways, it is kepping animals from eating, and they are dying. it is effecting land animals too, because some land animals eat sea creatures. So they die.
It is also harming us, because it is limiting our clean drinking water, causeing us to use more electricity to clean it.
If we all just stop polluting in the water, and treat it properly, we can all take a HUGE benifit from it. :)
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Because when you throw anything in the water it can make water turn mucky and kill helpless animals. Animals give us food , clothes, and many other things. When the water turns black that takes away our water supply. We need water to live. So when pollution happens, it puts your life in danger. Hope this answered your question!
one of the main cause is the spill of oils and other substances from ships...since population is also increasing day by day all sewage water and the industrial waste are drained into the water bodies.