Both systems make use of internal and external concepts. Necrosis may occur due to external or internal factors. The clitoris contains external and internal components. It has two aspects- external and internal. It is a response to certain external or internal stimuli. Ecosystems are controlled both by external and internal factors. Ecosystems are controlled by external and internal factors. It may be due to a combination of internal and external causes. This includes representing both external and internal qualities. Damselflies have a variety of internal and external parasites. Tribes are susceptible to overlapping external and internal definition. The conceptual view provides a level of indirection between internal and external. Corporations often rebrand in order to respond to external and/or internal issues. There are two types&colon; external and internal chills. Venous return is via the external and internal pudendal veins.