Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: The three types of muscles in the body include skeletal muscle, smooth muscle, and cardiac muscle. Answer: muscle
Example Output: Smooth, cardiac, and skeletal are all types of what?

Example Input: Passage: Phylum Nemertea The Nemertea are colloquially known as ribbon worms. Most species of phylum Nemertea are marine, predominantly benthic or bottom dwellers, with an estimated 900 species known. However, nemertini have been recorded in freshwater and terrestrial habitats as well. Most nemerteans are carnivores, feeding on worms, clams, and crustaceans. Some species are scavengers, and some nemertini species, like Malacobdella grossa, have also evolved commensalistic relationships with some mollusks. Some species have devastated commercial fishing of clams and crabs. Nemerteans have almost no predators and two species are sold as fish bait. Morphology Ribbon worms vary in size from 1 cm to several meters. They show bilateral symmetry and remarkable contractile properties. Because of their contractility, they can change their morphological presentation in response to environmental cues. Animals in phylum Nemertea show a flattened morphology, that is, they are flat from front to back, like a flattened tube. Nemertea are soft and unsegmented animals (Figure 28.18). Answer: nemertea
Example Output: The colloquial term "ribbon worm" refers to the mostly marine species of what phylum?

Example Input: Passage: Mirrors are made from highly reflective metal that is applied to a curved or flat piece of glass. Converging mirrors can be used to focus light headlights, telescopes, satellite TV receivers, and solar cookers all rely on this principle. Answer: mirrors
Example Output:
What are made from highly reflective metal that is applied to a curved or flat piece of glass?