The force necessary to maintain the speed of an object in free space is equal to
A. the force required to stop it.
B. the mass of the object.
C. zero.
D. the weight of the object.
Answer: C
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The earliest Homo species was ____
a. Homo erectus b. Homo sapiens c. Ardi d. Lucy e. Homo habilis
Which is an advantage of using hydrogen as an energy source?
A. Hydrogen is locked up in water and organic compounds. B. Hydrogen fuel cells are inexpensive. C. Hydrogen always produces fewer carbon dioxide emissions than coal or natural gas. D. Hydrogen requires no storage systems. E. Hydrogen produces no carbon dioxide emissions if produced with renewables.
Habitat loss is an underlying cause of species extinction.
Answer the following statement true (T) or false (F)
What was an unintended side-effect of the construction of the Aswan High Dam in Egypt in the 1970s?
A) Egypt and its southern neighbor, Sudan, fought a war over control of the area. B) The level of the Mediterranean Sea fell several feet, which hurt several port cities. C) It disrupted international trade in East Africa. D) The Sahara Desert became even drier, due to its impact on the water table. E) It led to the spread of a parasitic disease among the population, schistosomiasis.