In the following passage, the numbered spaces can be filled with biological terms.

During the light-independent reaction of photosynthesis, carbon dioxide is fixed to a five-carbon compound called (1), a reaction catalysed by the enzyme (2). This forms an unstable six-carbon intermediate that immediately splits into two molecules of (3). These molecules are then reduced to triose phosphate using energy from ATP and hydrogen atoms/electrons from (4).

Write the correct biological term matching each number:

(1) ___________________________________

(2) ___________________________________

(3) ___________________________________

(4) ___________________________________

Describe the light-independent reaction of photosynthesis.