Consider the degree of variation we have in the present day - everything from
pygmies to [the late] Andre the Giant.   And all of these 10 billion people are
considered to be "the same species".
Then consider that there's supposed to be only a 2% difference in genetic
sequencing between "us" and the orangutans.
And from a medical / anatomical / pharmacological view, pigs are supposed to be
the closest to humans.

Even small changes in genetic makeup can have profound changes on morphology.
There are cascades of biochemical processes that amplify basic chemical signals.
 That's why tiny amounts of hormones can do what they do - and over such a long
period of time.   Anabolics, thyroid, etc.

Real life isn't a bunch of male Sprague-Dawley rats - it's a rich interplay
between genes and environment, and intellectual capability, and spiritual drive
to achieve.

Talk to anyone who's designed and helped administer a drug study, or taught
students, or trained people, or studied twins....

And look at what they're doing with green fluorescent protein and knocking out
chlorophyll in plants, and growing human tissue structures....

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