Within the light-independent reactions, what can be said about the 3-carbon-atom molecules produced?

The 3 carbon molecules are important precursors to the final products of photosynthesis

3-carbon molecules are produced in the first and second stages of Light independent reactions also called the Calvin cycle where 3 - PGA (3-phosphoglycerate) and G3P (glyceraldehyde 3 phosphate) respectively are formed.

The first stage of the Calvin cycle is called the carboxylation phase where carbon dioxide from the atmosphere is used to form 3PGA

The second stage is called the Reduction phase where a phosphate group is removed from 3PGA to from the three carbon sugar G3P.

G3P is then used to make glucose, sucrose, starch and other carbohydrates essential for the plant.