Jaws Appear to Have Evolved from

question 73

Multiple Choice

Jaws appear to have evolved from

• A) the fusion of many bony elements found in the skin of the neck region of jawless ancestors.
• B) a large, bony shield that protruded from between the base of the pectoral fins.
• C) modification of a disk of bones surrounding the mouth in lampreys.
• D) skeletal rods that supported gill slits near the mouth.

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Definitions:

Breast-feed

The act of feeding a baby with milk directly from the mother's breasts, providing ideal nutrition and immunity.

Proximodistal Development

The principle that growth and development proceed from the center of the body outward.

Trunk

The main structural part of a tree that supports the branches, or the main body part of humans and other vertebrates that extends from the neck to the abdomen.

Legs

Limbs of the body used for standing, walking, and running; essential components in human locomotion.