Sentence:  There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, <WSD>evolved</WSD>. 
Meaning of the word marked with <WSD> tags:  Of a population, to change genetic composition over successive generations through the process of evolution.