co2 from different sources has different mixes of carbon isotopes.
First, we can measure chemical isotopes of co2 in the atmosphere.
The output of co2 by industrialization and other human activities—also rising, also measured.
We know where co2 comes from—because these molecules have chemical fingerprints.
For instance, there is no C-14 in co2 molecules that come from fossil fuels.
The quantity of gas (co2) in each tube is an index of the amount of growth of the yeast cells.
The pilot pulls a handle, and co2 floods the compartment, putting it out.
They can eat them and store them, but the disposal of the solid water and co2 is too difficult a problem.
H2O is water and co2 carbonic acid, both of which pass off in burning.
In anaerobic respiration, co2 is given off, but no oxygen absorbed.