1. The human retina has an area of about 1000 . If 125 million rods and 6.5 million cones are found there, show that you have about 131,500 sensory cells per square millimeter in your retina. 2. The...

1. The human retina has an area of about 1000

. If 125 million rods and 6.5 million cones are found there, show that you have about 131,500 sensory cells per square millimeter in your retina.

2. The brain is an organ and, like all organs, it is composed of multiple tissues. What are some of the tissues that make up the brain?