Biologists categorize the cue that stimulates young herring gulls to peck as a sign stimulus because the
pecking behavior ____.
a. requires learning to perfect
b. is completely instinctive
c. is triggered by presentation of the cue
d. is only triggered by the cue if it is accompanied by species-specific behaviors
e. appears both in the presence and absence of the cue
C
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While shopping at your local drugstore, you stop at the blood pressure machine. It measures your blood pressure as 115/75 (good—that's healthy!). This number means that
A. arterial pressure is 115 mm Hg when the ventricles contract and 75 mm Hg in between ventricular contractions. B. arterial pressure is 75 mm Hg when the ventricles contract and 115 mm Hg in between ventricular contractions. C. arterial pressure is 115 mm Hg when the atria contract and 75 mm Hg in between atrial contractions. D. your sinoatrial node generates a 115 mV signal and your atrioventricular node generates a 75 mV signal. E. your sinoatrial node generates a 75 mV signal and your atrioventricular node amplifies this to a 75 mV signal.
Which types of fish have gill slits hidden beneath a gill cover?
a. jawless fishes b. cartilagenous fishes c. bony fishes d. sharks and rays e. lampreys and hagfish
Which of the following best describes diversity change through time in succession?
A) steady increase over time B) steady decrease over time C) starting and ending with high diversity D) highest diversity in middle successional stages
The human tailbone is an example of a vestigial structure. A vestigial structure is one that is present in an organism but that has a reduced size and little or no function. For example, the human tailbone is tiny and plays no role in balance or locomotion. In contrast, the tailbone in other animals, such as dogs and cats, is prominent and serves a function. Vestigial structures are used to support the theory of evolution. What type of evidence do vestigial structures represent?
A) fossil evidence B) molecular biology C) comparative anatomy D) biogeography