Which of the following structures decreases diffusion distances for oxygen and carbon dioxide by delivering air directly to body cells?
A) Spiracles
B) Gill filaments
C) Parabronchi
D) Bronchi
E) Tracheoles
E
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Overexploitation of many species has increased due to the growing demand for wild animals and plants, and
A) the dramatic increase in world population. B) global warming. C) technological advances that have made it easier to obtain the animals and plants. D) an increase in the number of core reserves. E) sustainable agriculture, which has become more popular.
___________________ increases the permeability of the collecting duct in the nephron to water.
A. Anti-diuretic hormone (ADH) B. Aldosterone C. Atrial natriuretic hormone D. Angiotensin II
Choose the one most appropriate answer for each.
A. Barr body B. Histone C. Repressor protein D. Promoter E. Master genes F. Homeotic genes G. Dosage compensation H. Enhancers
Neil is a football player. We can tell whether he is getting enough calories by all the following EXCEPT
a. determining his body fat level. b. seeing if his body fat is about 5 percent to 18 percent. c. monitoring weight changes on a weekly basis. d. weighing him before and after football practice.