Exposure to a light source ____
a. increases melatonin levels
b. increase testosterone levels
c. decrease testosterone levels
d. is used to treat SAD and jet lag
e. is used to treat some cancers
ANSWER: d
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Which of these statements is true of the energy in an open system containing living organisms?
a. The system will quickly settle into equilibrium. b. This system will generate a net surplus of energy. c. There must be a net influx of energy to this system. d. Energy transfers cannot be tracked in open systems.
Most humans need about ________ kcal per day
A) 500-700 B) 1,300-1,800 C) 2,500-3,000 D) 20,000-30,000
Which class of gnathostomes is extinct?
a. Sarcopterygii b. Actinoptertygii c. Acanthodii d. Holocephali
Which of the above plants does NOT belong to the
same order? a. apple b. dog rose c. carrot d. marijuana e. all of these