Answer:
The carbon-dioxide exists in the atmosphere, and it is dissolved in the water.
Explanation:
With the process of photosynthesis, it becomes organic, and by breathing, the organic gas goes back to carbon-dioxide.
The assimilation of carbon is the process when the carbon-dioxide converts to organic carbon with the help of living organisms. This organic carbon is then used for energy.
Biotic refers to all living things.
It can be found in tissues
B is correct. Krypton is a noble gas which has a full outer shell of 8 electrons and is generally unreactive because of it.