Figure 232 Below Represents a Phylogenetic Tree of the Vertebrate Animals

question 71

Multiple Choice

Figure 23.2 below represents a phylogenetic tree of the vertebrate animals. According to this tree, what is the sister group to the tetrapods?

• A)sauropsids
• B)mammals
• C)lungfish
• D)amphibians
• E)coelacanths

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Definitions:

Molecules

The smallest unit of a chemical compound that can exist, consisting of two or more atoms held together by chemical bonds.

Refractory Period

A period immediately following an action (e.g., a neuron's firing or human ejaculation) during which a second action is difficult or impossible to initiate.

Neuron

A specific type of cell responsible for sending nerve signals; also known as a neuron.

All-Or-None Response

A neuron’s reaction of either firing (with a full-strength response) or not firing.