Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Input: Consider Input: Question: What part of the cell helps it keep its shape? Answer: cytoskeleton

Output: cytoskeleton. This is a network of fibers and tubules that crisscrosses the cytoplasm. The cytoskeleton helps the cell keep its shape.

Input: Consider Input: Question: What makes up the dense outer layer of bones? Answer: compact bone

Output: Compact bone makes up the dense outer layer of bones.

Input: Consider Input: Question: What term is used for darwin's idea that in stable geologic and climatic conditions evolution occurred gradually? Answer: gradualism
Output: When geologic and climatic conditions are stable, evolution may occur gradually. This is how Darwin thought evolution occurred. This model of the timing of evolution is called gradualism .