Saturated fats are solid at room temperature and unsaturated fats are not. a. Is butter an example

Question:

Saturated fats are solid at room temperature and unsaturated fats are not.
a. Is butter an example of a saturated or an unsaturated fat?
b. Is olive oil an example of a saturated or an unsaturated fat?
c. Explain why sterols like cholesterol can add “stiffness” to membranes that contain them.