A reinforcer is any reward that satisfies a basic, biological need, such a hunger, thirst, or touch

Which is a characteristic of mixtures?

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

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.