which of the following vertebrate organ systems does not open directly to the external environment?

Digestive system

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Circulatory system

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Excretory system

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Respiratory system

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Solution

The correct option is B Circulatory system
The circulatory system is the only system which is not exposed to the external environment.
So, the correct option is 'Circulatory system'.

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Similar questions

A system which does not exchange neither matter nor energy is called as an open system.

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