Air and water pollution are directly responsible for the loss of some species
In their studies of these pollution effects, biologists have determined that ________ are especially sensitive to air pollution, and are now being used as an index of urban air quality.
A) songbirds
B) evergreen trees
C) deciduous trees
D) lichens
E) warblers
D
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A polar molecule: a. has a positively-charged and a negatively-charged end
b. is neutrally charged all around. c. does not have a negative or positive charge. d. occurs only in frigid environments.
If a stream has a meandering section, that section is most likely to be ________.
A. braided B. in its upstream section near its source or sources or in its downstream section, near its mouth C. in its upstream section near its source or sources D. in its downstream section, near its mouth
Why is the molten metallic core of Earth necessary for life to exist?
What will be an ideal response?
Water and carbon dioxide combine to make a weak acid
a. true b. false