The law of states that mass cannot be created nor destroyed during a chemical reaction ? a: conservation of mass
b: averages
c: conservation of momentum
d: conservation of energy

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.