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

Ex Input:
Passage: Mollusks reproduce sexually. Most species have separate male and female sexes. Gametes are released into the mantle cavity. Fertilization may be internal or external, depending on the species. Fertilized eggs develop into larvae. There may be one or more larval stages. Each one is different from the adult stage. Mollusks have a unique larval form called a trochophore . It is a tiny organism with cilia for swimming. Answer: trochophore

Ex Output:
What is the unique larval form of mollusks called?

Ex Input:
Passage: Wings of bats and birds serve the same function. Look closely at the bones inside the wings. The differences show they developed from different ancestors. Answer: bones inside wings

Ex Output:
Wings of bats and birds serve the same function. which body part should you study to understand ancestral differences?

Ex Input:
Passage: possess a single, undivided lobe. Eutherian mammals also possess a specialized structure that links the two cerebral hemispheres, called the corpus callosum. Answer: cerebral

Ex Output:
Eutherian mammals possess a specialized structure called the corpus callosum that links what hemispheres?