3 ms·

Viable=fertile here

• InitialLastName 3y ago
  Some mules are fertile: http://news.bbc.co.uk/2/hi/science/nature/2290491.stm http://news.bbc.co.uk/2/hi/science/nature/2290491.stm
  • eviks 3y ago
    Extremely rare exceptions like are not a challenge to classification