When a Skater Pulls in Her Arms to Turn Faster

question 43

Multiple Choice

When a skater pulls in her arms to turn faster, her angular momentum

• A) increases.
• B) decreases.
• C) remains the same.
• D) Any of these choices, depending on circumstances.

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Definitions:

Tree of Life

The Tree of Life is a metaphorical and scientific concept describing the evolutionary relationships among various species on Earth across time, often depicted as a branching diagram.

Monophyletic Group

A group of organisms that includes an ancestral species and all of its descendants, representing a single branch on the tree of life.

Clades

Groups of organisms that consist of a single common ancestor and all its descendant species, representing a branch on the tree of life.

Derived Characters

Derived characters are traits that are present in an organism but were absent in the last common ancestor of the group to which the organism belongs, indicating evolutionary changes.