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

[EX Q]: Passage: Although most of a cell's DNA is contained in the cell nucleus, mitochondria have their own DNA. Mitochondria also have the machinery to manufacture their own RNAs and proteins. The human mitochondrial DNA sequence has 16,569 base pairs encoding 37 total genes: 22 tRNA genes, 2 rRNA genes, and 13 peptide genes. The 13 mitochondrial peptides in humans are integrated into the inner mitochondrial membrane, along with proteins encoded by nuclear genes. Answer: nucleus
[EX A]: Where is most of the cell's dna contained?

[EX Q]: Passage: The menstrual cycle includes events that take place in the ovary, such as ovulation. Answer: ovary
[EX A]: Ovulation takes place in what organ and is part of the menstrual cycle?

[EX Q]: Passage: Sponges come in a variety of shapes and sizes. For example, they may be shaped like tubes, fans, cones, or just blobs. They range in diameter from about a centimeter (0.4 inches) to over a meter (3.3 feet). Many species live in colonies that may be quite large. Adult sponges are sessile. This means they are unable to move from place to place. Root-like projections anchor them to solid surfaces such as rocks and reefs. Answer: sponges
[EX A]:
Root-like projections anchor adults of what colony-dwelling animals to solid surfaces such as rocks and reefs?