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All starts in the chloroplast, it collects CO2 from the air to start the calvin cycle.

Once in the chloroplast a enzyme called ribusco sticks RuBP with the CO2, creatin a 6 carbon chain.

Then this 6 carbon chain splits in two, so then we have two chains of 3 carbons, called PGAs

Then this two PGAs are delivered with ATP and a hidrogen each, changing them into glyceraldehyde 3 phosphates.

Glucose to be formed needs this two chains of G3Ps, so sugar is formed

But, RuBP need to came frome somewhere.

while this poroces is completiing, other 5 processes are completing. so it creates 36 carbons; six are used to crete glucose, and the other 30 are used to create new RuBP