Answer:
Saturated fats.
Explanation:
Fats are the long chain hydrocaron that contains the carboxyl group at one end. Fat is a olecule that contain that both the hydrophobic tail and hydrophillic head.
Saturated fats coatin single bond in its structure and unsaturated fats contain both double and triple bond in its structure. The saturated fat is solid at room temperature as the molecules are clossed together and make its a more solid and rigid structure.
Thus, the answer is saturated fats.