Ucan physically see the ? of a trait, but not the ?

U can physically c the Phenotype of a trait(looks), but not the Genotype(DNA). Ik this is right because I learned about this last yr.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.