Should I tell my teacher that two of the group members in my Science group plagarized their work?

We had partners in a group of five. We had to do a project powerpoint thing. I had Anatomical Evidence for Evolution, two had Molecular Evidence, and the other two had Palentology. The two that had Palentology took their work right off the internet and gave it to the girl who put the powerpoint together. They presented and had no idea what they were talking about. Should I tell my teacher they plagarized or leave the grade at an 88?