Describe the structure of the nephron and explain the role of each part of a nephron in creating urine

The nephron is the functional unit of the kidney. It does the job of the urinary system. The primary function of the nephron is to remove waste products from the body before they build up to toxic levels. The nephron does its job of getting rid of metabolic wastes through filtration and secretion.

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.