Most of the animals of mud flats are:
a. planktonic.
b. epifaunal.
c. oysters.
d. infaunal.
e. nektonic.
D
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Which of the following statements is true?
A. Tracheids are multicellular conduits, whereas vessels are unicellular conduits. B. Tracheids transport water, whereas vessels transport sugars. C. Tracheids are short and thin, whereas vessel elements are much wider. D. Tracheids compose the xylem, and vessel elements compose the phloem. E. Water enters tracheids through pits, whereas water enters vessels only through spaces between the cells.
A lizard is sitting on a rock on a cool, cloudy morning. As the day progresses the sun comes out and the temperatures of the rock and the lizard increase. What changes would be expected in the lizard's metabolic rate and activity level?
A. Both the metabolic rate and activity level would increase. B. Both the metabolic rate and activity level would decrease. C. The metabolic rate would increase and the activity level would decrease. D. The metabolic rate would decrease and the activity level would increase. E. The metabolic rate and activity level would not change.
The body loses fluids by four of the following means. Which is the exception?
a. urine b. evaporation from lungs c. retention of salts d. sweating e. elimination of feces
You are studying populations of a certain species of frog in two ponds five kilometers apart. There are no other ponds in the area. In pond A all the frogs are small and have a few black spots on them. In pond B most of the frogs are large and lack spots but a few are small without spots and a few are large with spots. Which of the following is the most likely cause of the genetic diversity seen in pond B?
A. The small frogs and spotted frogs in pond B are mutations. B. Pond A frogs resulted from individuals migrating from pond B. C. The small frogs and spotted frogs in pond B probably are the result of some frogs migrating from pond A to pond B. D. Meiosis generated more genetic diversity in pond B than in pond A.