An user Spanish
says…

Las
Determiner
  aletas
Noun
  dorsal
Adjective
  y
Coordinating conjunction
  anal
Adjective
  encuentran
Verb
  situadas
Adjective
  posteriormente
Adverb
.

The dorsal and anal fins are located posteriorly.
Words and sentences
New
las

New
aletas

plural of aleta

New
dorsal

New
y

New
anal

New
encuentran

third-person plural present indicative of encontrar

New
situadas

New
posteriormente

afterwards, later

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