I gave my students a research project worth 20 points. They had all week to work on it with a partner, then they presented their project. The situation is that one student was away on a school trip for most of the week and their partner was left to do most of the work on the project. But when it was time to present, the missing student was back from the trip and they both took equal turns presenting. Should I still give credit to the student who didn't participate much due to being away on a school trip? It's not the student's fault that they weren't able to work on it due to being away, yet, their partner was the one who did 99% of the work.