What must happen in order for scientific data to be verified through repetition? A Investigations must be conducted by trained scientists. B. Observations must be made by more than one scientist.
C. Accurate records must be kept.
D. Modem technology must be used.

(This is supposed to be science, not Biology)

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.

answercalled plucking;