Define saturated and unsaturated fats​

Saturated fatty acids lack double bonds between the individual carbon atoms, while in unsaturated fatty acids there is at least one double bond in the fatty acid chain. Saturated fats tend to be solid at room temperature and from animal sources, while unsaturated fats are usually liquid and from plant sources.

Hope it helps  

Have a great Day : P

a) the particles of the chair are strongly held together.