As you point out, plants break down the water molecules to produce the oxygen, but the CO2 is the fuel used for that process, just as my engine produces torque by using a combination of fuel (gasoline or diesel) and air.
You can choose a DNA without a subscription to the Ancestry.com service, a DNA test with a subscription to U.S. discovery service or a DNA test with World explorer. Once you choose an option, Ancestry.com will ship you a test kit. The test kit has a small mouth swab which you wipe on the inside of your mouth.
Isle of Jura Y-DNA Project is primarily for men who have paternal ancestry from the Isle of Jura, Scotland. Women who have maternal ancestry from the Island may also join the project. The aims of the project are: - to help individuals connect with their Y-chromosome genetic cousins.