iodine
yes
oxygen
CO2 is taken in by the plants from the atmosphere and O2 is released during photosynthesis.
That depends on what chemicals are being processed, you need to ask again with more details in your question.
Glowing gases observed during combustion is called a "flame."
For the dissolution of a solid in a liquid this solute is decomposed in atoms or ions; for the dissolution of gases in liquids or dissolution of solids in solids other processes are involved.
yes
Oxygen and carbon dioxide are the gases exchanged in the lungs during breathing.
Dissolution of gases in water is a physical change.
At higher pressure the dissolution of gases in liquids is increased.
The gases generated and released during the process of decay do.
I suppose that the dissolution is faster in fresh water but the differences are minimal.
oxygen
CO2 is taken in by the plants from the atmosphere and O2 is released during photosynthesis.
That depends on what chemicals are being processed, you need to ask again with more details in your question.
Glowing gases observed during combustion is called a "flame."
There are various gases that are released into the atmosphere. Carbon dioxide, methane, and nitrous oxide are three of them.