In the North Pacific Ocean, Two Groups of the Same

question 59

Multiple Choice

In the North Pacific Ocean, two groups of the same species of killer whales (Orcinus orca) appear to be forming two different species based on what they eat. One group eats fish and the other eats mammals such as seals. Scientists can tell what they eat based on their teeth, because whales that feed on fish have significantly different wear patterns.
-Another difference between the two groups is in how they hunt. Whales that hunt fish tend to travel in large pods (groups of whales) and vocalize often. Whales that hunt seals, however, tend to travel in very small groups and vocalize very little, likely because of the excellent hearing ability of seals. If these differences brought about speciation, the separation would be considered

• A) habitat isolation.
• B) temporal isolation.
• C) behavioral isolation.
• D) mechanical isolation.

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Definitions:

Simple Regression

An analytical approach that employs a linear equation to depict how a dependent variable is influenced by one independent variable.

Stepwise Regression

A method of regression analysis in which the selection of predictive variables is carried out by an automatic procedure, adding or removing predictors based on specific criteria.

Independent Variables

Variables in an experiment that are manipulated or changed to observe their effect on dependent variables.

Regression Model

A mathematical model that estimates the relationship between a dependent variable and one or more independent variables.