Ehrlich and Raven Hypothesized That If a New Defensive Trait

question 156

Multiple Choice

Ehrlich and Raven hypothesized that if a new defensive trait evolves in a single plant species (or if a new trait to counteract a plant's defenses evolves in an herbivore species) the appearance of that trait could result in a period of species diversification. Their hypothesis is also referred to as the _____ hypothesis.

• A)"diverge and converge"
• B)"reverse and diverse"
• C)"emit and commit"
• D)"merge and diverge"
• E)"escape and radiate"

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Definitions:

Developmental Change

Transformations or transitions in the psychological, emotional, or physical state of a person or group over time.

External Validity

The extent to which the findings of a study can be generalized to other people, settings, times, measures, and characteristics.

Internal Validity

The extent to which a research study accurately reflects or assesses the specific concepts or variables it is intended to measure.

Descriptive Field Studies

Research that involves observing and describing the behavior of subjects in their natural environment.