An Unrooted Tree Containing Four Unrelated Species Can Become Rooted

question 54

Multiple Choice

An unrooted tree containing four unrelated species can become rooted by adding

• A)a descendant group related to two of the species.
• B)an unrelated outgroup.
• C)a distantly related outgroup.
• D)a descendant related to only one of the species.

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Definitions:

Fibrous Joints

Joints that are connected by dense connective tissue, consisting largely of collagen. These joints are immovable or only slightly movable, such as sutures in the skull.

Cartilaginous Joints

Joints where the bones are attached via cartilage, allowing for limited movement.

Joint Capsule

A fibrous sac that encloses a joint, containing synovial fluid which lubricates the joint to reduce friction.

Double Layer

A double layer refers to two parallel layers of different substances, often seen in biological membranes or in materials science.