Red blood cells need iron. They store iron and typically contain more iron than the fluid around them does. Which action would show the blood cells doing active transport?
O pushing iron out
O bringing iron in
O swelling
O shrinking

bringing iron in

Step-by-step explanation:

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the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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