The chief limiting factor to the success of most trout species is
A. the dissolved oxygen content in water.
B. the amount of plant biomass.
C. the ability to reproduce.
D. All of these are correct.
Answer: A
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To produce a plane wave in water, use a
A. pointed finger. B. tuning fork. C. meter stick. D. all of the above
The place in the crust or mantle where igneous rocks begin to form is called the
A. magma chamber. B. extrusive area. C. intrusive area. D. source area.
Historically, the greatest threats to human health came from
A. Injuries (intentional and unintentional) B. Pathogenic organisms C. Psychological stress factors due to crowding D. Carcinogenic or toxic chemicals E. Teratogenic chemicals
The great scramble for African colonies occurred
A) just after the Napoleonic wars. B) during Portugal's domination of the world-system. C) as Spain was colonizing the America's. D) in the three decades preceding World War I. E) in the two decades after World War II.