Old cemeteries (pre-1900 ) often have gravestones that often host many types of lichens. However, it is not impossible to find old cemeteries where lichens are entirely absent. Given what is known about lichens, an old cemetery without lichens probably
A) has an unusually dry climate.
B) is subject to extremely cold winter temperatures.
C) gets a great deal of rain, which favors the growth of competing bacteria.
D) is close to a source of air pollution.
Answer: D
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A researcher is comparing atmospheric CO2 levels in Earth's northern and southern hemispheres during June-August. As more terrestrial plants are present in the northern hemisphere, what do you expect she will find?
A. Atmospheric CO2 measurements will be greater in the northern hemisphere. B. Atmospheric CO2 measurements will be greater in the southern hemisphere. C. As atmospheric CO2 measurements represent global amounts, measurements in the northern and southern hemispheres will be (approximately) the same.
A friend of yours visited a natural history museum that had a replica of the Archaeopteryx. She told you the characteristics of Archaeopteryx that she either noticed or read at the display. Which one did she misread?
A. Archaeopteryx had feathers, as do modern birds. B. Archaeopteryx lacked teeth, as do modern birds. C. Archaeopteryx had solid bones, unlike the hollow bones of modern birds. D. Archaeopteryx had wings as do modern birds. E. Archaeopteryx had a long tail, unlike modern birds.
Identify the disorder caused by a dominant allele
a. achondroplasia b. cystic fibrosis c. albinism d. sickle-cell anemia e. Down syndrome
The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?
A. They convert glucose to organic acids. B. They digest the cellulose of plant cell walls. C. They produce most of the vitamins needed by the ruminant. D. All of the choices are correct.