Which of the following is TRUE?
A) Natural selection always favors complexity and a larger body size.
B) Until recent history, extinctions have always happened gradually and on a small scale.
C) Most organisms present early in Earth's prehistory were more complex than modern organisms.
D) Species on Earth today are just a fraction of all species that ever lived.
E) The number of species existing at one time has decreased throughout history.
Answer: D
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A temperature inversion can adversely affect air quality and is characterized by ________
A) a layer of warm air forming above colder air B) a layer of warm air forming above the stratosphere C) a layer of cold air forming above warmer air D) inverted air masses with particulates held at altitude E) air masses in which primary and secondary air pollutants are inverted
How many different triglycerides can be formed when glycerol combines with one molecule of oleic acid, one molecule of palmitic and one molecule of stearic acid?
A) 1 B) 2 C) 3 D) 4
Which of the following statements is true of all electromagnetic radiation?
A) All electromagnetic radiation has the same frequency. B) All electromagnetic radiation has the same wavelength. C) All electromagnetic radiation travels at the same speed in a vacuum. D) none of the above
How do nuclear reactors and nuclear power plants generate electrical power?
What will be an ideal response?