In which of the following ways are metamorphic rocks formed?

Metamorphic rocks are formed through chemical changes caused by heat and pressure. When rocks are subjected to high temperatures and pressures, the minerals and textures within them can change. This process is called metamorphism. Metamorphic rocks are formed from pre-existing rocks, which can be igneous, sedimentary, or even other metamorphic rocks. During metamorphism, the rocks are subjected to intense heat and pressure, which can cause the minerals in the rock to change. This can result in changes to the color, texture, and overall appearance of the rock. Some common examples of metamorphic rocks include marble, slate, and gneiss. In contrast, the other options listed involve different processes for rock formation. Physical disintegration of igneous rocks and alternative layering of particles of sedimentary and igneous rocks are processes involved in the formation of sedimentary rocks, while the combination of igneous and sedimentary rocks can result in the formation of hybrid rocks known as igneous-sedimentary rocks. Biological change of original rock, on the other hand, is not a common process in rock formation.