Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Plant-like protists are called algae. They include single-celled diatoms and multicellular seaweed. Like plants, they contain chlorophyll and make food by photosynthesis. Types of algae include red and green algae, euglenids, and dinoflagellates. Answer: algae
A:
Plant-like protists are called what?