Primary succession may be seen:a
on new lava or on sand dunes.
b. after a fire.
c. when farmland is abandoned.
d. only in tropical rain forests.
e. in any community that has periodic disturbances.
a
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The frequency of sound waves reaching the ear determines:
A. intensity of sound B. loudness C. pitch D. tone
Energy enters most ecosystems by the process of
A. biosynthesis. B. respiration. C. biogeochemical weathering. D. photosynthesis. E. fermentation.
Which cutaneous receptors are sensitive to pressure?
A. Pacinian corpuscles and Ruffini endings B. Krause end bulbs and Merkel disks C. Root hair plexus and Krause end bulbs D. Pacinian corpuscles and Meissner corpuscles E. Ruffini endings and Merkel disks
Methylene blue can be used to stain DNA because it
A) forms ionic bonds with DNA. B) changes the pH and therefore the structure of DNA. C) covalently bonds with DNA. D) makes DNA electron dense. E) is an effective fixing agent for nucleic acids.