Remember: if the article only meets one of these criteria, it is not automatically a scholarly source. It is a culmination of the criteria that make it scholarly.
Primary - In scientific writing, when a scientist describes their own personal work or original research study it is a primary source. Primary sources include research articles, dissertations, technical reports, or conference papers. Primary sources are written for a specific audience (usually other scientists or researchers in the field) and to disseminate research findings that allows other scientists to refute or build upon that work.
Secondary - Secondary sources are articles that critique, discuss, or analyze a study. Overall, secondary sources talk about the research conducted by someone else. Secondary sources include encyclopedias, textbooks, and review articles.
If your professor has not specified which sources you should be looking for, feel free to ask.
Paraphrased from Writing in Biology: A Student Handbook for Writing in Biology, Karen Knisely, 2013, 5th edition, W.H. Freeman and Co