The ability to synthesize organic nutrients. Most of this is accomplished by Photosynthesis.
Hydrogen (from Step 1) combines with CO2 to form the 3 carbon compound PGAL. 2 PGAL compounds will combine.This forms Glucose: C6H12O6
Most photosynthesis occurs in the palisades mesophyll of the leaf where most chloroplasts are located.
Chloroplast...used for photosynthesis in Eukaryotic cells
Some bacteria use chemicals such as sulfur to make food. These bacteria are the producers in the food chain found around the Smokers at the bottom of the ocean.
Photosynthesis: imagine your are a carbon atom. Describe your trip from the air into a dandelion plant. Then into a rabbit that eats that dandelion. Then is returned back to the air.
Why is it needed to include plants on a space station?