Figure 25.3 -Applying the Principle of Parsimony to the Trait "Ability to "Ability

question 7

Multiple Choice

Figure 25.3
-Applying the principle of parsimony to the trait "ability to fly," which of the two phylogenetic trees above is most parsimonious?

• A) Tree 1
• B) Tree 2
• C) Both trees are equally parsimonious.

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Definitions:

Drive-reduction

A theory suggesting that psychological needs create an aroused state that drives an organism to reduce the need by engaging in some goal-directed behavior.

Physiological Need

A basic bodily requirement that is essential for maintaining life and health, such as the need for food, water, or sleep.

Glucose

A simple sugar that is an important energy source in living organisms and is a component of many carbohydrates.

Incentive

A thing that motivates or encourages someone to do something, often seen as a reward.