excretion of metabolic waste
Resparation is basically the release of energy but if you are talking about breathing in and out then the air fills in our lungs and enters the alveoli and a gas exchange happens. Oxygen diffuses into the low oxygnated blood and the carbon dixoide diffuses out, that carbon dixoide is brethed out and the oxygnated blood is sent to the rest of the body e.g organs and muscles wich use it as a source of energy.
yes
dry ice
vena cava
It would have to be photosynthesis
False, Ozone absorbs UV.
Algae and marine plants
theoretically yes, but in real systems nothing is pure.
because they have carbon dixoide in them which gives us oxygen to breathe.
Three: 1 C and 2 O atoms
well fisrt llits the bad air so its not good for anything :/
Ryan Seacrest