Question

the hairs on xanders arms just started lying flat against his skin. which is most likely his internal body temperature? 35°c 36°c 37.5°c 38.5°c

Explanation:

When the body is warm, the arrector pili muscles (which cause hair to stand up) relax, and the hairs lie flat. A normal body temperature is around \(37^{\circ}C\). \(35^{\circ}C\) is hypothermic (body would be cold, hairs might stand up due to shivering - related muscle activity). \(37.5^{\circ}C\) and \(38.5^{\circ}C\) are fevers. But relatively speaking, compared to \(35^{\circ}C\), a temperature closer to normal (\(36^{\circ}C\) is still within a range where the body is not in hypothermic stress and is warm enough for hairs to lie flat more likely than at \(35^{\circ}C\)).

Answer:

\(36^{\circ}C\)