In which animal is a crosscurrent flow system used for air exchange?
A. mammals
B. fish
C. birds
D. lizards
E. whales
Answer: C
Biology & Microbiology
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Which area is best known for its large effect of hydroperiod?
A) bottomlands B) prairie potholes C) fens D) bogs
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Acrosomes contain nutrients for the developing sperm cells, and they also secrete hormones and other signaling
molecules. Indicate whether the statement is true or false.
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Which of the following is/are NOT considered a part of the lower respiratory system?
a) Trachea b) Larynx c) Pharynx d) Bronchial tubes
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