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

[Q]: Passage: The nucleus is an example of an organelle . An organelle is any structure inside a cell that is enclosed by a membrane. Eukaryotic cells may contain many different organelles. Each does a special job. For example, the mitochondrion is an organelle that provides energy to the cell. You can see a mitochondrion and several other organelles in the animal cell in Figure above . Organelles allow eukaryotic cells to carry out more functions than prokaryotic cells can. Answer: an organelle
[A]: Any structure inside a cell that is enclosed by a membrane is called?

[Q]: Passage: Figure 32.21 Supernovas are the source of elements heavier than iron. Energy released powers nucleosynthesis. Spectroscopic analysis of the ring of material ejected by Supernova 1987A observable in the southern hemisphere, shows evidence of heavy elements. The study of this supernova also provided indications that neutrinos might have mass. (credit: NASA, ESA, and P. Challis). Answer: supernovas
[A]: What celestial events are the source of elements heavier than iron?

[Q]: Passage: heterotrophic animal that eats only or mainly insects. Answer: heterotrophic
[A]:
What type of animal that eats only or mainly insects?