Propose an explanation as to why there is a relatively high, Ask an Expert

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1. Propose an explanation as to why there is a relatively high incidence of dwarfism among the Old Order Amish of Lancaster, Pennsylvania.
2. What is the minimum criterion used to determine if two similar individuals are members of the same species?
3. Why are marsupials found almost exclusively in Australia?
4. How did Darwin relate the natural variations found within species to the organisms that tend to live longer and reproduce more often?

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Category:- Biology
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