Survival (%) 100- 80- 60- 40- 20- 0-t T 2.1 ( T T T - 1.9 2 2.2 2.3 2.4 2.5 2.6 2.7 Log SVL (mm) Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86) measured the snout-to-vent (anus) length of Galápagos marine iguanas and observed the percent survival of different-sized animals, all of the same age. The graph above shows the log snout-vent length (SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males (dashed line) and females (solid line). Based on the figure above what type of selection for body size appears to be occurring in female marine iguanas? (A) balancing selection (B) disruptive selection C) stabilizing selection (D) directional selection (E) sexual selection

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Animal behavior can be defined as all the things that animals do. In response to a stimulus, an animal performs a certain fixed action pattern, or FAP, of behavior. This response occurs to make the animal more adaptable to change. So, behavior is generally a stimulus-oriented response. A behavior is an expression of the capabilities of the nervous system. A stimulus is determined by the environment, while the nervous system determines a response.