Arods and cones
Bcones and cortex
Crods and pelvis
Dcortex and fovea
Answer:
A. rods and cones
Read Explanation:
The human retina contains two types of photoreceptor cells: rods and cones.
Rods: These cells are highly sensitive to light and are responsible for vision in low-light conditions (scotopic vision). They do not perceive color and provide black-and-white vision. There are approximately 120 million rods in each human eye.
Cones: These cells are less sensitive to light and function best in bright light conditions (photopic vision). They are responsible for color vision and fine detail (visual acuity). There are approximately 6 to 7 million cones in each human eye, concentrated in the fovea centralis.
The fovea centralis is a small depression in the retina where visual acuity is highest, and it is densely packed with cones.
Both rods and cones contain photopigments that undergo chemical changes when struck by light, initiating the visual signal.