I would say immigration only.
emigration would theoretically reduce the genetic variation as unique individuals leave, but immigration would bring unique traits into circulation in an ecosystem.
I'm not super great at biogy tho so this might not be right... :)
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Your body has different kinds of cells. Though they might look different under a microscope, most cells have chemical and structural features in common. In humans there are about 200 different types of cells and within this cells there are about 20 different types of structures or organelles.
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50 50 you have a large letter an a lil one that means one's dominant an the other isn't
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in order, blood vessels, capillary,artery,vein,cardiovascular system, ventricle, aorta, dont know 8 but nine is oxygen
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