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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from On the Origin of Species by Charles Darwin: Udders enlarged by use; rudimentary
Ulex, young leaves of
Umbelliferae, outer and inner florets of
Unity of type
Use, effects of, under domestication
Utility, how far important in the construction of each part
Valenciennes on fresh-water fish
Variability of mongrels and hybrids
Variations appear at corresponding ages; analogous in distinct species
Varieties, natural; struggle between; domestic, extinction of;
transitional; when crossed, fertile; when crossed, sterile; classification
On the Origin of Species | 
