<span>Your
brother develops a fever, extreme fatigue, and enlarged lymph nodes
throughout his body. if his illness is caused by a virus, the best
treatment is? </span> b. bed rest.
Light-sensitive cells in the retina at the back of our eye allow us to see. The human eye has two types: cones and rods. Rods are extremely efficient; a tiny amount of light can trigger them. They are responsible for our night vision.
