Haiti is settled by peoples of both african and european ancestry. a young couple, both with mixed ancestry, marry and have several children. the children vary widely in the amount of skin melanin production, with one child being lighter than either parent, and one being darker. the simple explanation for this is

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.