Define population pressures which is a selective pressure.

Selective pressures are environmental factors or influences which may lessen reproduction in a species’ population and therefore contributes to evolutionary change or even extinction through natural selection.

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Explanation:

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.