Light waves that have been emitted or reflected by an object enter the eye and first pass through the transparent layer called the where they are refracted. the light rays are then refracted again as they pass through the transparent

cornea; lens

cornea; retina

lens; retina

retina; cornea

Which experiment would most likely contain experimental bias

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

This is a biological reaction due to a stimulus. i need this quickly !