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

[EX Q]: Passage: The most noticeable magnetic activity of the Sun is the appearance of sunspots. Sunspots are cooler, darker areas on the Sun's surface ( Figure below ). Sunspots occur in an 11-year cycle. The number of sunspots begins at a minimum. The number gradually increases to the maximum. Then the number returns to a minimum again. Answer: 11
[EX A]: What is the year cycle that sunspots occur?

[EX Q]: Passage: If water is so simple, why is it special? Water is one of the few substances that exists on Earth in all three states of matter. Water occurs as a gas, a liquid and a solid. You drink liquid water and use it to shower. You breathe gaseous water vapor in the air. You may go ice skating on a pond covered with solid water ice in the winter. Answer: three matter states
[EX A]: In how many states does water exist on earth?

[EX Q]: Passage: 43.5 | Human Pregnancy and Birth By the end of this section, you will be able to: Explain fetal development during the three trimesters of gestation Describe labor and delivery Compare the efficacy and duration of various types of contraception Discuss causes of infertility and the therapeutic options available Pregnancy begins with the fertilization of an egg and continues through to the birth of the individual. The length of time of gestation varies among animals, but is very similar among the great apes: human gestation is 266 days, while chimpanzee gestation is 237 days, a gorilla's is 257 days, and orangutan gestation is 260 days long. The fox has a 57-day gestation. Dogs and cats have similar gestations averaging 60 days. The longest gestation for a land mammal is an African elephant at 640 days. The longest gestations among marine mammals are the beluga and sperm whales at 460 days. Answer: african elephant
[EX A]:
What land mammal has the longest gestation period?