Which of the following are reasons why sharks should be considered important to humans?
a. They never get cancer, and may provide information about how to prevent this disease.
b. They are an important source of food
c. They are a keystone species
d. They never get cancer and are an important source of food
e. They never get cancer and are a keystone species
E
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What is true of bathymetry?
A) It is the discovery and study of the ocean floor's contours. B) It uses orbiting robotic spacecrafts to enhance data. C) It is hindered by the very presence of our ocean. D) All of these choices are true.
What triggers a photochemical reaction?
A) turbulent winds B) sunlight C) ice particles D) high humidity
The auroras in the upper atmosphere are caused by
A) visible light interaction with the asthenosphere. B) AM radio broadcasts. C) various weather phenomena. D) the interaction of the solar wind and upper layers of the Earth's atmosphere.
The humid subtropical climates are generally bordered by:
a. tropical savanna climates on their equatorward sides. b. humid continental, mild summer climates on their poleward sides. c. oceans on their western margins. d. steppe climates on their eastern margins.