The nose, pharynx, larynx, trachea and bronchi all work like a system of pipes through which the air is funnelled down into our lungs. There, in very small air sacs called alveoli, oxygen is brought into the bloodstream and carbon dioxide is pushed from the blood out into the air.
And, just to clarify, the kitty litter in your trunk, to be used for traction, needs to be taken out and spread around your tires. Most cars are front wheel drive, so the extra weight alone in the back ain't gonna do you much good.
The Tula Infant Insert has three pieces which should be used together at first but which can be used independently as well when needed. The Tula Infant Insert should only be used with the baby-sized/standard carrier, and is not suitable for use with the Toddler Ergonomic Carrier.