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.

Question: What type of tissue is made up of cells that have the unique ability to contract? Answer: muscle tissue
Muscle tissue is made up of cells that have the unique ability to contract, or become shorter. Muscles attached to bones enable the body to move.

Question: Mineral crystals that form when magma cools are usually _______ than crystals that form when lava cools. Answer: larger
Mineral crystals that form when magma cools are usually larger than crystals that form when lava cools.

Question: What is the name of the black opening in the eye that lets light enter? Answer: pupil
Next, light passes through the pupil. The pupil is a black opening in the eye that lets light enter the eye.