What internal and external structures do giraffes have that help it survive? List at least 3 structures and explain how each structure helps it survive!

The neck, Tongue, Heart and circulation and Lungs.

Explanation:

The Neck: The total length of the giraffe's neck is 6 feet and carries the muscles of about 550 pounds. But the unique characteristics is that it has same vertebrae as humans have i.e. 7.  And to support these heavy muscles at the base of the neck spines are there projecting upwards.

The Tongue: Giraffe has a very avaricious long tongue that helps it to gets different vegetation.

Heart: Surprisingly the heart of the giraffe is small in structure yet powerful. And the blood pressure is quite high, double relatively to human so to pump the blood to its brain along with the long neck.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.