Although photovoltaic electricity is considered a "clean" power source, one issue with this electricity is that it ________
A) is not sufficiently understood
B) will be replaced shortly with other sources of power for homes
C) is dangerous if stored too long
D) is less efficient than fossil fuels
E) cannot be stored easily in large quantities
Answer: E
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Before the appearance of cells capable of sexual reproduction, ____
A)there was no life on Earth B)evolution was comparatively slow C)evolution was comparatively fast D)cells could not reproduce E)multicelled organisms existed
Wave-formed ripple marks ____
A)tend to have symmetrical profiles B)are good indicators of ancient current directions C)have a gentle slope and a steep slope D)form in undisturbed deep-sea sedimentary environments E)form when clay-rich sediment dries and shrinks
Prairie grasses experience grazing herbivores, wildfires, droughts, deep snow, and blazing hot days in the summer
The prairie grasses alive today are descendants of those that have survived these challenges and thus must have ________ for such an environment. A) endemism B) predation C) speciations D) adaptations
An accurate forecast ____
A) always shows skill B) may or may not show skill C) never shows skill D) requires complex computer equipment