From my experience, many in-person students also don't know many professors and ask for recs based on their classroom interactions/scores/projects. Obviously th

From my experience, many in-person students also don't know many professors and ask for recs based on their classroom interactions/scores/projects. Obviously this won't be the strongest recommendation, but it's probably more common than you think. A lot of students will have relevant internships or work experience -- this definitely would make for a great recommendation letter! If you're pursuing a PhD, it would be ideal to have some undergrad research experience. I assume you'd pursue this online similarly to in person -- taking an interest in a professor's work and reaching out. Or over the summer, there are jobs at national labs and plenty of undergrad research experience summer programs.