A Shared Ancestral Character Is

question 16

Multiple Choice

A shared ancestral character is

• A)a character that originated in an ancestor of two taxa.
• B)shared by all mammals but not found in their ancestors.
• C)an evolutionary novelty unique to a clade.
• D)an outgroup character.

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Definitions:

Meninx

Meninx (plural, meninges) refers to one of the three membranes (the dura mater, arachnoid mater, and pia mater) that cover the brain and spinal cord.

Periosteum

The periosteum is a dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints, serving as a site for attachment for muscles and bones.

Nervous System

A complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.

Meningitis

An inflammation of the protective membranes covering the brain and spinal cord, a condition that can be caused by infection with viruses, bacteria, or other microorganisms.