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wariber [46]
3 years ago
12

Science help!

Biology
1 answer:
romanna [79]3 years ago
4 0
A or D... depending on which country you are talking about and if it is a developed or developing country...
the effects of overcrowding will definitely be negative...
sorry not much help!
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Your question: What gas found in cigarette smoke and automobile exhaust, blocks the transport of oxygen by hemoglobin in the blood..?

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