The film of fluid in the pleural cavity functions to:
a. nourish the lungs.
b. rehydrate the lungs.
c. provide lubrication between the lungs and thoracic wall.
d. trap bacteria that may enter the lungs.
e. inflate the lungs.
c
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The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
The ____ contains hydrolytic enzymes for the digestion of proteins, lipids, nucleic acids, and
polysaccharides.
a. Golgi complex b. rough endoplasmic reticulum c. nucleus d. peroxisome e. lysosome
The venous blood in the right ventricle is referred to as "mixed" because the blood that enters the heart
A) is drained from the body. B) comes from tissue with differing metabolic activities. C) contains a mixture of oxygen and carbon dioxide. D) has a lowPO2. E) has a highPCO2.
In ________ selection, individuals intermediate in a phenotypic distribution have greater reproductive success.
A. balancing B. negative frequency-dependent C. directional D. stabilizing E. disruptive