Which is the role of the enzyme rubisco?
a. condensation of ribulose 1,5-bisphosphate with carbon dioxide.
b. regeneration of ribulose 1,5 bisphosphate molecules.
c. splitting of a six-carbon product during the calvin cycle.
d. condensation of ribulose 1,5 bisphosphate with carbon dioxide and splitting of a six-carbon product during the calvin cycle.

Option D, Condensation of ribulose 1,5 bisphosphate with carbon dioxide and splitting of a six-carbon product during the Calvin cycle.

Explanation:

The enzyme Ribulose 1,5- bisphosphate carboxylase/oxygenase act as a catalyst in the reaction where CO2 attaches to ribulose 1,5-bisphosphate. In the end of this process, an unstable six carbon compound is formed.

Ribulose 1,5- bisphosphate is a molecule containing 5 - carbon molecule an when it combines it with CO2 during the Calvin cycle it splits into two molecules of 3-phosphoglyceric acid (3-PGA) which contains three carbon. This reaction is catalysed by Ribulose 1,5- bisphosphate carboxylase/oxygenase enzyme.

Hence option D is correct.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.