Disruptive Selection Maintains a Bimodal Distribution of Bill Size in the West

question 35

Multiple Choice

Disruptive selection maintains a bimodal distribution of bill size in the West African seedcracker because

• A) bills of intermediate shapes are difficult to form.
• B) the birds' two major food sources differ markedly in size and hardness.
• C) males use their large bills in displays.
• D) migrants introduce different bill sizes into the population each year.
• E) older birds need larger bills than younger birds.

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Definitions:

Unmodulated Color

A color that is consistent in hue and intensity across a surface, without gradation in tone or shade.

Medium

The material (for example, marble, bronze, clay, fresco) in which an artist works; also, in painting, the vehicle (usually liquid) that carries the pigment.

Humanity

The collective term for all human beings, or the qualities that characterize human beings, such as benevolence, compassion, and the ability to think and reason.

Red And Green

Often considered opposites on the color wheel, this color combination is known for its striking contrast and has various cultural, psychological, and artistic implications.