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In need help with the passage

On thin ice

The first quetion is It is implied that ice floats and land is important to swimming polar bears because...

a
B
c
d

I want to know where i can find the answers to the rest of then answer. If you already know this can you tell me the answers to all the problems.
I also need help with another passage called

Excerpt from Niagara falls
Anyone know the answer key?



Answer :

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