Anyone know the answers?

What must happen before a body cell can begin mitotic cell division

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.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false