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For centuries, the nature of the brain was shrouded in mystery. Aristotle is said to have 1 it wa...

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A number of scientists found genes in the 18th and 19th centuries.  Scientific discoveries were made one after another in the 18th and 19th centuries.  Many scientists succeeded in finding out how the features of living things were passed on to the next generation in the 18th and 19th centuries.  It took a long time for scientists to find out why members of the same family look like each other.  
get close to the nature    get close to nature    get closely to nature    get closely to a nature  
in her nature; by    her natural ; at    in one’s nature; by    nature; in the  
go against    go across    go by    go over  
from nature  by nature  through nature  out nature  
by nature    in nature    against nature    of nature  
the men; natures  man; the nature  the man; the nature  man; nature  
from nature    by nature      through nature    out nature  
nature is being ruined   which nature is ruined   on which to ruin nature   of nature to be ruined  
It was not until the eighteenth and nineteenth centuries that; had begun  It was not until the eighteenth and nineteenth centuries when; began  Not until the eighteenth and nineteenth centuries did; begin  Until the eighteenth and nineteenth centuries; began  
widely  found  in nature  as well as  
nature  the nature   a nature  natures