All of the following are examples of an external stimulus except.

Hunger

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Sunlight

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A loud sound

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A thorn

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Solution

The correct option is A
Hunger

The senses that evoke responses in organisms are called stimuli. There are stimuli, that are formed inside the body and are known as internal stimuli like hunger and thirst. The stimuli that are received from the environment like light and heat are known as the enternal stimuli.

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