Part B The cytoplasm of a neuron contains many negatively charged proteins, which give the cell a slightly negative charge at
rest. What do you think happens to this charge when the neuron is stimulated?

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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.

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