Many Phylogenic Trees Can Be Calibrated in Time Based On

question 30

Multiple Choice

Many phylogenic trees can be calibrated in time based on:

• A) fossil and/or geological record
• B) frequency of mutations
• C) number of nodes and branches
• D) whether the tree is rooted or unrooted
• E) "housekeeping" genes

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Definitions:

Sacral Hiatus

An opening at the end of the sacral canal in the vertebral column, through which nerves and membranes can pass.

Superior Articular Facet

A part of a vertebra that connects with an adjacent vertebra above it, facilitating spinal movement and support.

Median Sacral Crest

A ridge of bone on the posterior surface of the sacrum, formed by the fusion of the spinous processes of the sacral vertebrae.

Posterior Sacral Foramina

Openings located on the dorsal side of the sacrum bone through which nerves and blood vessels pass.