Carbon dioxide from exhaling, feces and urine, and methane and nitrous oxide from belching and flatulence.
The collagen in the Jell-O is collected by boiling cow skins. This is what causes the gelatin to thicken.
aluminium
Urea
three
Oxygen
The actual production of bikes will have the same byproducts as any other mechanical industry using the same materials, and riding a bike will have the same byproducts as any other way of getting exercise.
oxygen and sugar
oxygen and gluecose
three
stuff like stuff
that's its yellow and filling
A+ Nuclear energy