Which of the following would be most vulnerable to extinction?
A) A healthy plant, such as a pine tree, that completely dominates its native environment
B) A moth, brought to the United States for silk production, escaping into the wild and becoming established
C) A migratory flock of warblers stopping along its winter route to feed on local resources that are now gone and replaced by a suburb
D) An orchid endemic to a forest where logging is occurring
D
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It is not possible to estimate the annual peak discharge of the 100-year flood if you do not have at least
99-years worth of data. Indicate whether the statement is true or false.
During the Cenozoic, brachiopods ____
A)greatly expanded their numbers and diversity B)were greatly reduced in number of genera C)took over habitats previously occupied by mollusks, forcing those creatures to go extinct D)became the most important marine invertebrate phyla E)became extinct
Earth systems science depends on the validity of the Gaia hypothesis
Indicate whether the statement is true or false
Explosive eruptions of pyroclastic debris and gases are associated with which type of volcanoes?
A) Shield volcanoes B) Composite cone volcanoes C) Bulging volcanoes D) Concave volcanoes