An user Galician
says…

Os
Determiner
 primeiros  traballos
Noun
  en
Adposition
  xenética
Noun
  foron
Auxiliary
 realizados  por
Adposition
 Mendel.

The first work in genetics was done by Mendel.
Words and sentences
New
os

New
traballos

plural of traballo

New
en

New
xenética

New
foron

third-person plural preterite indicative of ir

New
por

  1. indicates motion
  2. for (over a period of time)
  3. about, around (near, in the vicinity of)
  4. for (to obtain)
  5. for (in exchange for)
  6. for (on behalf of)
  7. times, by, multiplied by
  8. by (indicates the actor in a clause with its verb in the passive voice)
  9. by, by means of
  10. per

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