Use the figure to answer the question.
Which morphological trait evolved more than once in animals, according to the phylogeny based on DNA sequence data found in the figure?
Definitions:
Sheaths
Protective coverings or cases that enclose a part or object, such as a blade or a cable.
Extensors
muscles that increase the angle between components of a limb, working to extend or straighten out the limb.
Tissue
Groups of similar cells in an organism that work together to perform specific functions.
Pathology Present
The existence of disease or disease processes as identified by studying bodily tissues and fluids.
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