Guano is significant because
A) it is a major source of phosphorus.
B) its presence is considered a sign of an imminent volcanic eruption.
C) it is a major part of the global sulfur cycle.
D) it is a sign of a pioneer community.
A) it is a major source of phosphorus.
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As human populations have spread over most of the globe, extinction rates have dropped.
Answer the following statement true (T) or false (F)
Biodiversity scientists view the worldwide decline in bird species with alarm because
A. birds are protected under the Endangered Species Act. B. birds are an important source of food for many people. C. birds are excellent environmental indicators. D. birds live in nearly every climate and biome. E. about three fourths of all bird species live in forests.
Human-induced subsidence in coastal areas increases flood potential. Indicate whether the statement is true or false
The earth's atmosphere is divided into layers based on the vertical profile of:
a. air pressure. b. air temperature. c. air density. d. wind speed.