Why do arteries need to be thick, muscular, and elastic?
to make our bodies strong for movement
to withstand the pressure of the blood that is being pumped by the heart
to pull the blood back to the heart from all areas of the body
to withstand changes in blood temperature

silty loam

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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.