List three examples of trace fossils
What will be an ideal response?
a. Tracks—animal footprints made in soft sediment that later became sedimentary rock.
b. Burrows—tubes in sediment, wood, or rock made by an animal. These holes may later become filled with mineral matter and preserved. Some of the oldest-known fossils are believed to be worm burrows.
c. Coprolites—fossil dung and stomach contents that can provide useful information pertaining to the size and food habits of organisms.
d. Gastroliths—highly polished stomach stones that were used in the grinding of food by some extinct reptiles.
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Which of the following properties determines the kind (wavelength) and amount of radiation that an object emits?
A. temperature B. latent heat C. density D. thermal conductivity
Natural increase is an especially important factor in urban areas of
A. Africa B. Europe C. Latin America and Asia D. The former Soviet region E. The United States
Why do TEM images not form well in crystals with a random arrangement of atoms?
A) With randomly arranged atoms, there is a greater chance that the electrons will miss the atoms, resulting in poor images. B) Crystals with random arrangements of atoms often have a more reflective surface, so the electrons bounce off the surface of the crystal, resulting in poor images. C) A random arrangement of atoms in a crystal means that the atoms are extremely small, resulting in poor images. D) A random arrangement of atoms in a crystal means that the atoms are extremely large, resulting in poor images.
The more genetically diverse a population is, the more likely ______.
Fill in the blank(s) with the appropriate word(s).