Pulmonary circulation is the type of circulation that explains the movement of blood from the heart to the lungs and back to the heart again.
Blood that does not carry oxygen originates from the heart and moves to the lungs where it is filled with oxygen. Oxygen filled blood from the lungs travels back to the heart where the oxygen is used up.
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Alleles are each of two or more alternative forms of a gene that are found at the same position in a chromosome. Traits on the other hand, are the characteristics that are defined by genes. ... For example, the gene that codes for the shape of a pea has two alleles, wrinkled and round.
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I would guess it's B. increased sailinty
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Because if you do you would be helping nature