Boys I need help look at the screenshot and answer please

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

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.

Are oil and water a mixture or solution