Pls metamorphic rock forms as a result of a, the cooling of magma b. compaction of sediments c. heat and pressure d. the melting of rock

The correct answer is option C, that is, heat and pressure.

Explanation:

The formation of metamorphic rocks takes place due to the chemical and physical alteration by pressure and heat of the prevailing sedimentary or igneous material into a denser form. Because of the activity of compression, plate tectonics, shearing forces, and stress for the prolonged time duration, the rocks can get deformed and warped, making them get trampled into a smaller space volume.  

Due to this, the metamorphic rocks are always more condensed in comparison to their original substance, and also much less vulnerable to erosional dissociation. With the movement of the plates of the Earth over the geologic time, a plate comprising sedimentary or igneous rock may turn subducted underneath another plate. The absolute weight of the above substance makes the rock to go through metamorphism.  

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.