A pheromone is
a. a new form of chemical insecticide awaiting approval by FIFRA
b. a strong herbicide
c. a species-specific chemical sex attractant
d. a bloodstream chemical that controls an organism's growth and development
e. a safe, natural pesticide
C
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Pangaea was
A) a supercontinent centered on present-day Africa. B) an area of active earthquakes and volcanoes. C) an area of colliding plates that formed the Himalaya Mountains. D) the divergent plate that created the Rocky Mountains in North America. E) a deep ocean trench created by colliding plates.
The existence of stream terrace is sure evidence of ____.
a - entrenched meanders b - delayed tributary junction c - rejuvenation d - knickpoint e - volcanic activity
Germany, France, Italy, and other western European countries encouraged guestworkers to immigrate and work in factories, helping to rebuild war-torn economies in western Europe
Indicate whether the statement is true or false.
Given an approximate ocean surface area of 362 × 106 km2, how much water must melt from the glaciers and ice caps to result in a 3-meter sea-level rise?
A. 3.62 × 106 km3 B. 1.09 × 109 km3 C. 1.09 × 103 km3 D. 1.09 × 106 km3 E. 3.62 × 103 km3