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2. Plastic garbage kills 1 million birds and 100,000 marine mammals each year.
At that rate how many birds will be killed in a decade? How many marine mammals?
The answer is 10 million birds and 1 million marine mammals.
There are 10 years in a decade. 10 multiplied by 1 million equals 10 million. 10 multiplied by 100,000 equals 1 million.
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