Which of the rows, A to D, shows the correct responses to the changes in the internal or external environment?
 | Changes in the internal or external environment | Responses |
A | Blood carbon dioxide concentration increases | Breathing rate decreases |
B | High blood glucose concentration | Pancreas releases insulin hormone |
C | Decrease in body temperature | Hair erector muscles relax |
D | Increase in body temperature | Vasoconstriction |
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