Carotenoids are organic pigments that are found in the chloroplasts and chromoplasts of plants and some other photosynthetic organisms, including some bacteria and some fungi. Carotenoids can be produced from fats and other basic organic metabolic building blocks by all these organisms.
   Senegal is a republic with a presidency; the president is elected  every five years as of 2001, previously being seven years, by adult  â¦ voters.
The area that today is Senegal once was part of the West African Empire of Mali, Ghana, and Tekrur. The country takes its name from the river that runs along its northern and eastern borders, forming the frontier with Mauritania and Mali.