Um... Explosive
Climbers need to wear oxygen masks to help them breathe as the air is thin higher up Mount Everest than at sea level.
Question not clear.
Yes, baby bottles should be completely dry before use to prevent bacterial growth and ensure safety and hygiene for infants.
Animals need oxygen to carry out life processes. Plants need carbon dioxide. Some animals and plants can use either if they need to.
The element we need to breathe is oxygen. It is essential for cellular respiration, where our cells convert oxygen into energy to carry out their functions.
Haemoglobin.
Plants need sunshine to carry out photosynthesis.
Gills carry oxygen fish need directly from the water
Yes, you can carry an oxygen machine while traveling, but you may need to make arrangements with the airline or transportation provider beforehand.
If you mean 'Why do climbers carry oxygen cylinders on mountains' then that is to survive. On high mountains like Mount Everest the air (oxygen) is so thin you need help to breathe, so they use oxygen from a cylinder.
Organisms use the oxygen they absorb from the air for their cells. The cells need this oxygen in order to carry out their functions.
Spacecraft need an internal oxygen supply to provide a breathable atmosphere for astronauts during space travel. Since there is no oxygen in space, spacecraft must carry their own supply to support human life. This ensures that astronauts have the necessary oxygen to breathe and carry out their activities while in space.