Question

no explaination is needed

8. The primary nitrogenous waste excreted by cnidarians is a) ammonia b) nitrate. c) urea d) uric acid. 9. Birds secrete uric acid as their nitrogenous waste because uric acid a) is readily soluble in water. b) is metabolically less expensive to synthesize than other excretory products. c) requires little water for nitrogenous waste disposal, thus reducing body mass d) excretion allows birds to live in desert environments. 10. The osmoregulatory excretory system of an insect is based on the operation of a) protonephridia b) metanephridia c) Malpighian tubules. d) nephrons. 11. As N (population size) approaches (carrying capacity) for a certain population, which of the following is predicted by the logistic equation? a) The growth rate will not change. b) The growth rate will approach zero. c) The population will increase exponentially d) The carrying capacity of the environment will increase. 12. Which curve best describes survivorship in a marine crustacean that moults? Number of survivorstlog scate a) A b) B c) d) D 13. A mark-recapture study would be a good way to find out how many a) queens live in a bechive. b) cubs that black bears in Minnesota are likely to produce c) pine trees live in a forest. d) fish live in a lake. IPTOP

Answer 1

8. a. Ammonia

9. c. requires little water for nitrogenous waste disposal thus reducing body mass

10. c. malphigian tubules

11. b. the growth rate approaches zero.

12. d. D

13. d. fish live in a lake