Which of the following is a closed system?
A. An underwater ocean cave
B. a forest habitat
C. an aquarium
D. A cave with abundant life that was sealed off from the outside world during a landslide 100 years ago.
Answer: D
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The H1N1 swine flu pandemic of 2009-2010 resulted in the immunization of millions of people. When the immunizations were first available, people under the age of 25 or over 65 were given priority. This was done because H1N1
A) was a hazard to people in these age groups, and only these people were vulnerable to infection. B) was most problematic for these age groups, who were most vulnerable to the hazard and thus at the greatest risk. C) was not a hazard to these people, but they were most vulnerable to infection. D) vaccines worked only on people in these age groups.
Someone argues that he or she doesn't drink tap water because it contains thousands of molecules of some impurity in each glass. How would you respond in defense of the water's purity, if it indeed does contain thousands of molecules of some impurity per glass?
A. The water contains water molecules and each water molecule is pure. B. Compared to the billions and billions of water molecules, a thousand molecules of something else is practically nothing. C. There's no defense. If the water contains impurities, it should not be drunk. D. Impurities aren't necessarily bad, in fact, they may be good for you.
Which of the following is the approximate pressure of oxygen in venous blood?
A) 40 mm Hg B) 100 mm Hg C) 160 mm Hg D) 760 mm Hg
Underwater mountains or ridges usually form at the subduction zone, where two oceanic plates collide
Indicate whether the statement is true or false