How Many Times Have Wings Evolved Independently in Vertebrates

question 5

Multiple Choice

How many times have wings evolved independently in vertebrates?

• A) Once
• B) Twice
• C) Three times
• D) Four times
• E) More than four times

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Definitions:

Marginal Cost

The cost of producing one additional unit of a product or service.

Two-part Tariff

A pricing strategy that includes a fixed fee plus a variable charge based on usage or consumption of a product or service.

Marginal Cost

The expense associated with manufacturing an extra unit of a product.

Parking Fee

A charge imposed for the use of parking facilities, often varying based on location, time duration, and parking amenities.