Thank you Michael for your help.
The (auto) populate input fields from dropdown selection is still vary murky.
I looked up a bunch of posts about "populate input fields based upon dropdown html", but they are very difficult to follow.

<select id = "Build" onchange = "moi.ui.populateinputs('????');">
// where populateinputs is a javascript function in <script> section </script.>

The 4+ parameter values will be in a 2d array or list, indexed by the dropdown selection. Each row can be for one species of animal.
Look up the 4+ values for the selected animal. They vary for different animals.
aSlider.value = 1.2;
bSlider.value = 0.42;
etc.
Then set the different Sliders, which have binding to input fields,
(or to inputs aValue, bValue, etc.)

moi.ui.fireUIEvent("aSlider");
moi.ui.fireUIEvent("bSlider"); etc.
Or moi.ui.fireUIEvent('aValue")...

- Brian
(I've started a new script with some biological curves and structures...
It has 12 input fields plus some 3 more boxes, plus 10 buttons to become a dropdown select,
which will take up a lot of screen space...)