Man that's rough... and there's NO chance to give the presentation even at a reduced mark? Anyways, don't console your friend, i would try to be more active and talk to his teacher... or get the mom to talk to the teacher, or the school counselor. Talk to anybody in higher authority than the teacher ASAP, bring your work to show it to them, and tell them how unfair that is... hell, even if you only get 75% or even 50% of what the mark is it's better than a zero.