Birds differ from earlier vertebrates by
a. their lack of scales.
b. producing land eggs.
c. the ability to maintain a relatively constant
body temperature.
d. the ability to fertilize eggs internally.
e. their possession of a dorsal nerve cord.
C
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Members of the phylum Thermotogae can be found growing in
A. the intestinal tract of mammals. B. soils of the Antarctic. C. marine salterns of the shore of the Dead Sea. D. marine hydrothermal vents and terrestrial solfataric hot springs.
Smells and food aromas often produce an intense emotional impact. What is the biological basis of this response?
What will be an ideal response?
Which of the following injuries would be most
difficult for your body to repair?
a. broken leg b. a deep cut on your foot c. a twisted ankle d. a torn biceps muscle e. an ulcer
Viruses defy characterization as living organisms even though they possess nucleic acids and proteins. The reason why viruses are not considered to be alive is because they
A. cannot form spontaneously. B. cannot reproduce without a host cell. C. form spontaneously. D. lack genetic material.