Most Biologists Think That Feathers Were Evolved to Help Birds

question 41

Multiple Choice

Most biologists think that feathers were evolved to help birds

• A) fly.
• B) attract mates.
• C) float in water.
• D) hide from enemies.
• E) retain heat.

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Definitions:

Demand Curve

A graphical representation of the relationship between the price of a good and the quantity demanded, typically downward sloping, indicating an inverse relationship.

Marginal Cost

The cost of producing one more unit of a good or service, considering variable costs but not fixed costs.

Block Pricing

Practice of charging different prices for different quantities or “blocks” of a good.

Price Discrimination

Practice of charging different prices to different consumers for similar goods.