The microorganisms and/or biologically derived compounds or molecules that cause disease in personnel, plants, or animals are called : Pathogen The term is first time introduced n 1880. Pathogen usually invade a host and caused irregularity within its cells
"They contain at least one double or triple bond" is true of saturated fatty acid chains. This extra bond is why they are called "saturated", because they had less ability to take on other bonds.
