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

Passage: Solutions can also become supersaturated , where the amount of solute dissolved exceeds its solubility. Supersaturation most commonly occurs when a saturated solution is slowly cooled. They occur frequently in geological and meteorological processes. Supersaturated systems are unstable, and eventually, the solute will precipitate until a saturated solution is regenerated. We can quantify supersaturation by looking at solubility curves. If the ratio of solute to solvent is above the saturation curve at the given temperature, the solution is supersaturated. If it is on the curve, the solution is saturated, and if it is below the curve, the solution is unsaturated. Answer: its solubility
Solutions can also become supersaturated , where the amount of solute dissolved exceeds what?

Passage: Figure 6.11 The frictional force supplies the centripetal force and is numerically equal to it. Centripetal force is perpendicular to velocity and causes uniform circular motion. The larger the F c , the smaller the radius of curvature r and the sharper the curve. The second curve has the same v , but a larger. Answer: centripetal force
What force is perpendicular to velocity and causes uniform circular motion?

Passage: Figure 38.4 The skeletons of humans and horses are examples of endoskeletons. (credit: Ross Murphy). Answer: endoskeletons
The skeletons of humans and horses are examples of what?