Despite great diversity, all vertebrates share which basic homeostatic mechanism(s)?
a. digestion only
b. metabolism only
c. respiration only
d. digestion and metabolism
e. digestion, metabolism and respiration
ANSWER: e
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Examine the digestive system structures in the figure above. The highest rate of nutrient absorption occurs at location_____
A) 1 B) 2 C) 4 D) 5 E) 8
Which of the following groups give rise to a disease similar to that caused by Shigella sp.?
A. enterotoxigenic B. enteroinvasive C. enteropathogenic D. enterohemorrhagic E. All of the choices are correct
The Cretaceous is the period in which
a. mammals diversified and flourished. b. life appeared on this planet. c. the first animals with shells and skeletons appeared. d. the dinosaurs reached their peak and then became extinct. e. the first human-like apes appeared.
In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. In an experiment, the researchers put the smaller guppies that had previously lived only with cichlids (which eat large guppies) in a river portion that only had killifish (which eat smaller ones). a. What did they observe over the course of eleven years? b. What do you predict would happen if they performed the opposite experiment and mixed guppies from killifish river portions to a river with only cichlids?