Sewage treatment facilities depend on __________ to remove most of the organic matter and pollutants from wastewater.
Fill in the blank(s) with the appropriate word(s).
Ans: prokaryotic decomposers
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Because oxygen is more electronegative than hydrogen, the water molecule is:
A. hydrophobic. B. hydrophilic. C. nonpolar. D. ionic. E. polar.
The fusion of gametes of malaria-causing Plasmodium takes place ____
a. in the gut of a female mosquito b. in the liver c. in the mosquito salivary glands d. inside white blood cells e. inside red blood cells
In the countercurrent exchange system of fish gills,
A) blood and water flow in the same direction. B) blood and water flow in opposite directions. C) blood and water are separated by a thick polysaccharide barrier. D) blood flow in the gills reverses direction with every heartbeat.
Which of the following environments would harbor psychrophiles?
A. mountain lake with a water temperature of 12 °C B. contaminated plates left in a 35 °C incubator C. yogurt cultured at room temperature D. salt pond in the desert with a daytime temperature of 34 °C