Not enough information
Human beings breath in oxygen, and breath out CO2. The plant's leaves, when making photosynthesis, use CO2 and a few other things to make photosynthesis. When finished with making photosynthesis, the leaves release some oxygen, which is the gas we use to breathe. Thus, oxygen is the useful gas made by photosynthesis.
when you breathe in, you breathe in oxygen which is then transported to your cells and they use it to and food to respirate.
The breakdown of food without the use of oxygen is fermentation.
Animals take in oxygen and release carbon dioxide.
Aerobic respiration requires oxygen; anaerobic respiration does not use oxygen.
You can test for oxygen by placing a glowing splint (not lit but not out) into the test tube where you think oxygen is present. If the splint relights, that means that it is oxygen. If this doesn't happen, then in your case it will be nitrogen.
To test oxygen content in a canned product, you should use an oxygen absorber packet. This can tell you (not exact) how much oxygen is in something, like a package.
Feather
In the lab. and for small quantities. use the 'pop' test. Allow the hydrogen to be in contact with oxygen, then put a flame to it. It will 'pop'.
You could use spectroscopy as a definite method, or you could use an oxidizing agent that reacts with O2 (Oxygen), such as Iron, Nitric Acid, or halogen compounds.
No cell produces oxygen; oxygen is made in the hearts of stars. Plant cells responsible for photosynthesis, liberateoxygen from carbon dioxide molecules. Plants use the carbon to made carbohydrates (with the hydrogen from water) and the oxygen is the waste product.
Ions are
malleability
Tenure means to have the right to hold property. My sister had to spell tenure on her spelling test.
Because if released in the air(oxygen) the mixture becomes explosive. Remember in the lab. to test for hydrogen is the 'pop' test. This is hydrogen igniting with oxygen.
the property must be taken from a person or removed from the presence of a victim and the taking must be by use of force or by putting the victim in fear.
Definitely. They no longer use 100% oxygen during the pre-mission test of the vehicle. They no longer pump up the oxygen to 16 psi during the test. They still use fire retardant materials and paint in the vehicles. They still seal every wire to make sure there are no shorts to cause a spark. These life saving measures are necessary for every successful space mission.