Processes help the body warm up when it is cold are:-
a. shivering
c .hair on body laying flat
d. goose bumps forming hair on body standing up
Shivering cause tighten and relaxing of muscles in rapid succession to warm up.
Hair trap air and create insulting layer between the skin and the colder temperature outside.
The tiny muscles contract at the base of hair that make them stand on end, distorting the skin to create goose bumps.
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