List the two organisms involved in the production the hybrid, mule.

It is the hybrid of a Donkey and a Horse, The mule is fast like a horse and can carry heavy items a long distance. Technically a mule is a old fashioned moving truck, Kind of like how they used horses as cars. Unfortunately they cannot breed because the genetic "deformity" (being a hybrid)  messed up its chromosomes. I hope this helped out :D

B] nitrogen fixationmight be wrong, so correct me.want extra on your answers? just go on my account and go on questions and answer, or ask in the comments!