Lake Victoria, shown in the population map above, is the largest lake in Africa and is home to fish called cichlids (pronounced SIK-lids). In the 1950s, a new

fish, the Nile Perch, was introduced into Lake Victoria. This map shows the

change in the cichlid population since the Nile Perch was introduced.

Use the map above to answer the questions below.

1. Using a Key In which year was the number of cichlids the greatest?

2. Using a Key How many years did it take for the cichlid population to decrease

by 50 percent?

3. Inferring Relationships Which fish in Lake Victoria do you think is higher on

the food chain

the cichlid or the Nile Perch? Explain your answer.

4. Identifying Trends Based on the rate of decrease of cichlids shown on the map,

what do you think will happen to the cichlid population by 2050? Explain your

answer.

Part a - prefixes, roots, and suffixes match these prefixes, suffixes and roots to their meanings. phospho- angio- -uria -tropic -phag- a. the word root means blood or lymph vessels. b. the word root means urine. c. the word root means feeding or eating. d. the word root means phosphate or phosphorus. e. the word root means attracted specifically to the specified organ or tissue. part b – match these vocabulary terms to their meanings. gonadotropic polyuria angiotensin ii polyphagia phosphodiesterase upon the release of renin, is produced and stimulates vasoconstriction and the release of aldosterone. fsh and lh are examples of hormones, which target the ovaries or testes. an enzyme that degrades second messengers like camp or cgmp is . overproduction of urine, or , is a sign of diabetes mellitus. overeating, or , is a sign associated with diabetes mellitus.

Which layer of the eye completely surrounds the eye except for a dark, round opening called the pupil? a. sclerab. corneac. retinad. choroidthe answer is a sclera

The term autotroph refers to an organism that: a. uses co2 for its carbon source. b. must obtain organic compounds for its carbon needs. c. gets energy from sunlight. d. gets energy by oxidizing chemical compounds. e. does not need a carbon source