The answer is RuBP.
<span>
Calvin Cycle consists of three stages:
1. fixation: the enzyme RuBisCO incorporates
(fixes) carbon-dioxide into 3-PGA.
2. reduction: 3-PGA is reduced using NADPH as
electron supply.
<span><u>3. regeneration: RuBP is regenerated and starts the cycle again.</u></span></span>
Answer:
It is also called a finite resource
Explanation: