Refer to the Figure

question 12

Multiple Choice

Refer to the figure. This phylogenetic tree shows the predicted evolutionary relationships between protists and other eukaryotes.Based on the tree, _______ are a _______ group.

• A) protists; monophyletic
• B) protists; polyphyletic
• C) protists; paraphyletic
• D) eukaryotes; polyphyletic
• E) eukaryotes; paraphyletic

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Definitions:

Stream-Cut Canyon

A deep valley formed through the prolonged action of a stream cutting through the terrain, often displaying steep sides.

Downcutting

A process by which a stream or river erodes its bed, deepening it over time, often leading to the formation of canyons or valleys.

Dynamic Equilibrium

A condition of a system in approximate steady state where there is a balanced inflow and outflow of materials.

Graded Stream

A stream in equilibrium, showing a balance between its capacity to transport sediment and the amount of sediment supplied to it, thus with no overall erosion or deposition of sediment.