You are presented with the question "What is the key to newborn survival?" and the following answer choices: 
- deoxyribonucleic acid
 - insulated material
 - empty nest
 - food and shelter
 - cold bed
 - Thyroid-stimulating hormone
 - chemical messengers
 - eating fish

Now knowing that insulated material can be used for keeping warm and warm chain is the key to newborn survival, choose the best answer.


 

  insulated material       