what are the names of the 5 different types of relationships between an independent variable and dependent variable

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.

What human activity increases beach erosion?

Ab c or d ? i’m not sure what the answer is