Which organelle would you expect to find in the cells of a fern but not a flatworm?

You would expect to find chloroplasts in the cells of a fern but not in a flatworm. Ferns are photosynthetic plants that contain chloroplasts, allowing them to convert sunlight into energy. In contrast, flatworms are non-photosynthetic animals that lack chloroplasts and obtain energy through different means, such as consuming organic matter.