What evidence supports a conservation law?
6 co2 → c6h12o6 + 6 o2
6 co2 + 6 h2o + light → c6h12o6 + 6 o2
6 h2o + light → c6h12o6 + 6 o2
6 co2 → 3 c6h12o6 + 3 o2

The correct option is B. 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

Explanation:

According to the conservation law, energy or matter changes fro one form to another but it is neither created nor destroyed.

According to this law, the number of molecules present in the reactants should be equal to the number of molecules present in the products.

The equation B is rightly balanced and hence it is the correct option.

Other option A,B and D are not balanced and hence are wrong according to the conservation law.

6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

Explanation:

The concept of energy was fundamental to the growth of science, in particular physics. We know that it is possible to transform any type of energy into another, however, it is impossible to “create” or “spend” energy in a literal sense. It is also possible to transfer energy from one body to another, as for example, the Sun transfers part of its energy to us in the form of light.

The general principle of energy conservation says that the total energy of an isolated system is always constant. When we mention the word isolated, we mean that the system does not interact with other systems, since interactions between systems are usually carried out through an exchange of energy between them. For this reason, as the energy is constant, the energy provided by the molecules of a product must be the same as that provided by the molecules of the reagent. The result of this is a balanced equation like: 6 CO2 + 6 H2O + light → C6H12O6 + 6 O2

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.