batsh

I am a new studen of A & P and I being study for my homeworks,but there are some tricky question or may be a mistake. I made a research about bifurcated bone in my book,in a medical dictionary and in the internet,but nothing apear like this.I think that is a mistake in the question,so please help me to make this clear!! In human,both the bones of the forearm and legs are bifurcated.This is not the case of the horses.When is bifurcation more structurally advantageous than a single bone? Would two bones be better at the arm and thigh? Thank you!

I am a nurse student ,I study a lot ,even though I find some difficult question for my classes,so please if you can help me with some usefull information I apreciated. Thank you;Batsh In what way is a bone similar to a corked bat? What advantages and disadvantages does this provide as opposed to a bone that consisted only of compact bone?