The Phylogenetic Tree Below Represents a Phylogeny of Different Species

question 92

Multiple Choice

The phylogenetic tree below represents a phylogeny of different species of butterflies. What is represented by the circled area on the phylogeny?

• A)the most recent speciation event
• B)the appearance of a new mutation
• C)the appearance of a new genetic variant
• D)a common ancestor
• E)a species that must be extinct

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Definitions:

Peripheral Nervous System

The division of the nervous system outside the brain and spinal cord, including sensory and motor neurons.

White Matter

The part of the brain and spinal cord composed of myelinated nerve fibers that facilitates communication between different brain regions and between the brain and spinal cord.

CNS

The central nervous system, comprising the brain and spinal cord, which coordinates and controls most bodily functions.

Myelinated Axons

Axons that are coated with myelin, a fatty substance that speeds up the transmission of nerve impulses, enhancing the efficiency of the nervous system.