'In 1846 Joseph Leidy discovered that the worm trichina is found in this animal'
pigs
SCIENTISTS: In 1846 Joseph Leidy discovered that the worm trichina is found in this animal
In 1846 Joseph Leidy discovered that the worm trichina is found in this animal
In 1846 Joseph Leidy discovered that the worm trichina is found in this animal
SCIENTISTS
pigs
SCIENTISTS