The high heat of vaporization of water helps you to feel cooler when you sweat because the transition of water from a liquid to a gas requires a ______ of energy to break hydrogen bonds. The energy is _____ from heat produced by your body, thus helping to lower the surface temperature of your body.
A. release; released
B. release; obtained
C. input; obtained
D. input; released
C. input; obtained
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If a leach field floods it becomes anoxic and effective treatment ceases.
Answer the following statement true (T) or false (F)
Scientific work involves ______________________________.
A. the natural and supernatural world B. retesting theories frequently for verification C. proving theories with absolute certainty D. testing hypotheses under every possible circumstance E. coming up with the best objective descriptions of reality
Generally, vaccines are used to stimulate the immune system by providing antigens of potential pathogens. What is the typical composition of a vaccine?
A) genes encoding for virulence factors B) RNA from bacteria C) naked DNA D) inactivated or attenuated viruses
In the case of comparing birds to other vertebrates, having four appendages is
a. a shared ancestral character. b. a shared derived character. c. a character useful for distinguishing the birds from other vertebrates. d. an example of analogy rather than homology.