Located in central Africa,   Question5 ▽ 5. (A) Lake Victoria is 5. (B) and Lake Victoria is 5. (C) Lake Victoria's being 5. (D) although Lake Victoria is  a very unusual lake.

Question6 ▽ 6. (A) It not only one is 6. (B) Is it one not only 6. (C) One is it only not 6. (D) Not only is it one of the largest lakes in the world; it is also one of the youngest.

Estimated to be about 15,000 years old, it is a relative baby compared with Earth’s other very large lakes, Question7 ▽ 7. (A) are 7. (B) they are 7. (C) which being 7. (D) which can be more than two million years old. Yet judging by the variety of life in it, Lake Victoria Question8 ▽ 8. (A) resembles 8. (B) portrays 8. (C) views 8. (D) likes  a much older body of water. Usually, lakes need a much longer time Question9 ▽ 9. (A) is populated 9. (B) they are populated 9. (C) to become populated 9. (D) becoming populating by a diverse array of life-forms.

Question10 ▽ 10. (A) Is 10. (B) It is 10. (C) Being 10. (D) Because it is common for new lakes to contain only a small number of species. Lake Victoria, however, is Question11 ▽ 11. (A) opened 11. (B) packed 11. (C) satisfied 11. (D) purchased with colorful fish, most notably, cichlids. There are Question12 ▽ 12. (A) many 12. (B) as many 12. (C) too many 12. (D) as many as 500 different species of just this one type of fish.