16.Countercurrent heat exchange is most directly advantageous because it: (A) Reduces heat loss by transferring heat from warm blood to cooler blood. (B) Maximizes heat loss to prevent overheating. (C) Prevents oxygen delivery to tissues at low temperatures. (D) Eliminates the need for insulation.

2.Which of the following statements about the River Continuum Concept is incorrect? (A) From upstream to downstream, FPOM is gradually replaced by increasingly abundant CPOM. (B) Many fishes in headwater streams require well-oxygenated water. (C) Microbes are significant consumers throughout much of the river continuum. (D) Benthic invertebrates can be classified into functional feeding groups (e.g., collectors, grazers/scrapers, shredders) based on how they acquire organic matter.

16.Countercurrent heat exchange is most directly advantageous because it:
(A) Reduces heat loss by transferring heat from warm blood to cooler blood.
(B) Maximizes heat loss to prevent overheating.
(C) Prevents oxygen delivery to tissues at low temperatures.
(D) Eliminates the need for insulation.

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