Waste water
oil pollution
river dumping
marine dumping
Answer:
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Explanation:
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On one side of the grand canyon could be a squirrel with a birth defect witch reproduses with a squirrel with normal genes. But the birth defect is stronger than whatever trait that may be. so the litter of squirrels mostly have this trait. and the cycle contiues
Nasa because they have more tools and are better equiped and trained to find galaxies than anyone .
