Fossil Evidence Suggests That Feathers Existed Prior to the Development

question 70

Multiple Choice

Fossil evidence suggests that feathers existed prior to the development of a flight-capable skeleton; because these feathered animals could not fly,biologists suspect that the initial adaptive value for feathers was related their ability to

• A) serve as insulation.
• B) reduce an animal's suitability as prey.
• C) create an enlarged body contour and discourage predators.
• D) accept metabolic waste and reduce the need of water for urine production.

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Definitions:

Root Penetration

The depth to which weld material extends into the base material at the root of the joint, crucial for joint strength.

Root Reinforcement

Additional material added at the root of a weld joint to ensure the joint has sufficient thickness and strength.

Groove Welds

Welds that fill in the groove between two adjacent components to join them, used in various types of joint designs.

Contour

The outline or surface form of an object, which can be represented graphically or through mathematical equations in design and analysis.