The parent may have had an recessive gene that didn't show up in them but showed up in the the offspring!!
Answer:
protein
Explanation:
Proteins are constructed from an organism's DNA, which the DNA makes the RNA, which makes proteins. These proteins conduct the basic functions for the organism.
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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... :)
