Although not present in animals, many plants and microorganisms can use a modified form of the citric acid cycle known as the glyoxylate cycle. This is beneficial in that:
A. it does not release CO2 which is toxic to these organisms.
B. it allows the organisms which possess it to convert acetyl CoA into glucose precursors.
C. it provides a source of glyoxylate which is an essential molecule in biosynthetic pathways in these organisms.