Which of the following compounds are easily destroyed by heat?

Vitamins are organic compounds that are essential for various biochemical functions in the body and are particularly sensitive to heat. Many vitamins, especially water-soluble ones like vitamin C and several B vitamins, can degrade or lose their potency when exposed to high temperatures during cooking or processing. This heat sensitivity can lead to significant nutrient loss, making it crucial to use appropriate cooking methods to preserve these vitamins.

Minerals, on the other hand, are inorganic substances and are generally stable when exposed to heat. Crystalline and amorphous solids refer to the structure of materials, and their stability also does not significantly change with heat in the same way that vitamins do. Thus, the unique susceptibility of vitamins to thermal decomposition makes them the correct answer in this context.