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Fill in the blank with the correct word pair: The heart exchanges blood that is oxygen _______ with blood that is oxygen ________ to keep our cells alive. *

high/low

rich/poor

red/blue

saturated/unsaturated

Respuesta :

laveena58

Answer:

The second one - rich/poor

Explanation:

However it would be in reverse order so when filling in the blank, poor would come first then rich

but if you are not able to change it then you can just leave it like that.

I hope this helped☺