(Answer #1). Oxygen is absorbed in the lungs and transported all over the body by blood; when the blood releases its oxygen, it absorbs carbon dioxide (waste) and transports that back to the lungs, where it is expelled.osted on. (Answer #1). Oxygen is absorbed in the lungs and transported all over the body by blood; when the blood releases its oxygen, it absorbs carbon dioxide (waste) and transports that back to the lungs, where it is expelled. This process is called respiration.
If the child is 4 years AND 40lbs, then he may move to a booster with vehicle lap shoulder belt seatbelt. If not, then the child needs a larger FF harnessed seat. There are many seats that harness to 55-80lbs.
Booster seats or child safety seats are required until age 6. Children must be in forward-facing seats or convertible seats until age 5 or 40 lbs. Infant seats and convertible seats are required to be rear-facing until passenger is at least 1 year old or 20 lbs. in weight.