What is the epiglottis?
A) a muscle that moves the esophagus into line with the pharynx during swallowing
B) a muscle that moves the trachea out of line with the pharynx during swallowing
C) a flap that flips down to cover the entry to the trachea during swallowing
D) a muscular sphincter that closes off the entry to the trachea during swallowing
C
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Which of the following statements is false?
a. Many fossils have not been discovered, whereas others may have been destroyed. b. Some types of organisms are more likely to be preserved than others. c. Pressure and mineralization lead to fossil formation. d. Aerobic environments favor fossilization. e. Most fossils form in sedimentary rock.
The release of liquid water by leaves when soil moisture is high is known as:
a. vaporization. b. photosynthesis. c. guttation. d. transpiration. e. abscission
The botulism bacterium can kill a person by:
A) causing brain hemorrhages. B) killing muscle cells. C) secreting a toxin that paralyzes muscles. D) producing lethally high fevers.
Under runaway sexual selection, which of the following is/are reasons for "exaggerat-ed" male ornaments?
a. An exaggerated ornament increases male survival. b. The genes for male ornament and female preference are tightly genetically linked. c. A male's fitness is increased by virtue of being attractive to females. d. An exaggerated male ornament is unrelated to resistance against parasites. e. B and C.