Which of the following requires bright light in order to distinguish colors?
a. rods
b. cones
c. sclera
d. iris

The correct answer is B. Cones require bright light in order to distinguish colors.

Explanation:

Cones are the eye cells responsible for color vision. It is believed that there are three types of cones, sensitive to red, green and blue, respectively. Given their form of connection to the nerve endings that are directed to the brain, they are responsible for the spatial definition. They are also little sensitive to light intensity and provide photopic vision (vision at high levels).

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.