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

Example Input: Passage: Young reptiles, like the baby alligator in Figure below , look like smaller versions of the adults. They don't have a larval stage as most amphibians do. Baby reptiles are able to move and search for food but are at high risk of predation. Adult reptiles rarely provide any care for their offspring once the eggs are laid. The only exceptions are female alligators and crocodiles. They defend their eggs and hatchlings from predators and help them reach the water. Answer: larval stage
Example Output: What developmental stage do alligators lack that most other amphibians have?

Example Input: Passage: Pea plants are naturally self-pollinating. In self-pollination , pollen grains from anthers on one plant are transferred to stigmas of flowers on the same plant. Mendel was interested in the offspring of two different parent plants, so he had to prevent self-pollination. He removed the anthers from the flowers of some of the plants in his experiments. Then he pollinated them by hand with pollen from other parent plants of his choice. When pollen from one plant fertilizes another plant of the same species, it is called cross-pollination . The offspring that result from such a cross are called hybrids. Answer: cross-pollination
Example Output: What is it called when pollen from one plant fertilizes another plant of the same species?

Example Input: Passage: By gaining an electron, the chlorine atom becomes a chloride ion. It now has more electrons than protons and a charge of -1. Negative ions are named by adding the suffix ide to the first part of the element name. The symbol for chloride is Cl - . Answer: negative ions
Example Output:
What kind of ions are named by adding the suffix -ide to the end?