Holy122
Holy122 Holy122
  • 08-07-2016
  • Biology
contestada

Which is an external stimulus?
A. Thirst
B. Hunger
C. Pain
D. Heat

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lakshaybhandari
lakshaybhandari lakshaybhandari
  • 08-07-2016
C.Pain is the answer.
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Аноним Аноним
  • 08-07-2016
D. Heat, heat is an external stimulus. An external stimulus is a signal that originates from outside an organism.
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