Which NFPA label should you affix to a chemical that is unstable at warm temperatures?

Using an ICD-9-CM code book, select the appropriate code(s) for the diagnostic statements given in the following questions

Abnormal placenta found by ultrasound

The _________ system permits the body to take air to the lungs, where a gaseous exchange occurs between the alveoli and circulating blood cells.

Fill in the blank(s) with the appropriate word(s).