The blood<span>, which is now low in oxygen, is now collected in veins and travels to the right atrium and into the right ventricle. Now pulmonary circulation starts: The right ventricle pumps </span>blood<span> that carries little oxygen into the pulmonary artery, which branches off into smaller and smaller arteries and capillaries.
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They could be white or black. Black should be dominant, I guess, so 75% of offspring should be black.
If a molecule is too big or has a charge it will not diffuse through the membrane by passive transport.
