Answer:
A growing problem
Yet history is not the only reason why flood-prone locations are overpopulated. For one thing, rising sea levels and a changing climate are putting more cities' residents at risk. And what's more, new homes are still being built in flood-prone areas around the world.
Explanation:
Hope it's help
Oxygen's valence, based on the Number of valence electrons or outermost electrons that oxygen has would be 6.
I am sure that the answer is D
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