Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Photoautotrophs are cells that capture light energy, and use carbon dioxide as their carbon source. There are many photoautotrophic prokaryotes, which include cyanobacteria. Photoautotrophic prokaryotes use similar compounds to those of plants to trap light energy. Answer: photoautotrophs
A:
What type of cells capture light energy, and use carbon dioxide as their carbon source?