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.
Location and Geography. Senegal, situated on the western tip of Africa, covers an area of 76,000 square miles (196,781 square kilometers). It is bordered on the north by Mauritania, on the east by Mali, on the south by Guinea and Guinea-Bissau, and on the west by the Atlantic Ocean. The long, narrow Republic of the Gambia is approximately two hundred miles long, surrounded by Senegal's southern region.