Fact 1: Insulated material can be used for keeping warm. Fact 2: Warm chain is the key to newborn survival. Given the two facts above, answer the question "What is the key to newborn survival?" with the following options: - deoxyribonucleic acid - insulated material - empty nest - food and shelter - cold bed - Thyroid-stimulating hormone - chemical messengers - eating fish
A:
insulated material