The method to reproduce a plant by burying a portion of its stem is called .

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there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

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.