Great question again! The brain is so fragile because it doesn’t have a hard outer shell. That is why it is inside our skulls! It is made up of lots and lots of soft materials like cells , fat and protein. We need to protect this as there are lots and lots of brain vessels all over the brain surface too. We don’t want them to get damaged either so our skulls are very important!
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H2005 commented on :
thank you for another great answer Hayley