TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: The body of a cnidarian consists of two cell layers, ectoderm and endoderm. The cells surround a digestive cavity called the coelenteron (see Figure below ). Cnidarians have a simple digestive system. The single opening is surrounded by tentacles, which are used to capture prey. The tentacles are covered with nematocyst cells. Digestion takes place in the coelenteron. Nutrients are absorbed and gases exchanged through the cells lining this cavity. Fluid in the coelenteron creates a hydrostatic skeleton. Answer: tentacles

SOLUTION: Cnidarians have a simple digestive system with a single opening surrounded by what type of structures, which are used to capture prey?

PROBLEM: Passage: Carbohydrates include sugars, starches, and fiber. Sugars and starches are used by the body for energy. One gram of sugar or starch provides 4 Calories of energy. Fiber doesn't provide energy, but it is needed for other uses. At age 13 years, you need about 130 grams of carbohydrates a day. Figure below shows good food sources of each type. Answer: 4

SOLUTION: How many calories of energy does one gram of sugar or starch provide?

PROBLEM: Passage: Echinoderms generally reproduce by external fertilization; regeneration is fairly common among echinoderms. Answer: external fertilization

SOLUTION:
What is the method of reproduction for echinoderms?