How does the incomplete rings of trachea can protect our respiratory system?

Why is there a 37 Degree Celsius incubation step after the addition of a substrate in the ELISA format? The energy-producing or energy-storing molecule is called? What other benzylbenzoate chemicals do i need to avoid if I have had a bad skin allergy to benzylkonium chloride? Why do women put their hands over their mouth when surprised or whatever? What is an Infograph? What causes a loss of transperancy of the lens and can cause blindness? What urinary tract infections start with the letter k? What are side effects of tongue rings? What comes after octuplets? Why does cancer occur? What is bladder blade? How does a baby fit inside a uterus at eighteen weeks if the mother's belly is not very noticeable? What term is meant for a blood clotting disorder? Is it safe to use xepanicol for ear infection? How long does it take to get rid of a pinkeye? What conditions are indicated by swollen joints? Is a diaphragm transplant possible? What are some opinions on the Lee majors hearing aid? What are the symptoms of UTI? Are Clinique products safe to use in pregnancy?