The Following Questions Refer to the Evolutionary Tree in Figure

question 61

Multiple Choice

The following questions refer to the evolutionary tree in Figure 22.4,whose horizontal axis represents time (present time is on the far right) and whose vertical axis represents morphological change.
Figure 22.4
-Which of these five species is the extant (that is,not extinct) species that is most closely related to species X,and why is this so?

• A)V;shared a common ancestor with X most recently
• B)W;shared a common ancestor with X most recently
• C)Y;arose before X
• D)Z;shared a common ancestor with X

---

Definitions:

Prefrontal matter

Refers to the gray matter of the prefrontal cortex, a region of the frontal lobes of the brain involved in decision-making, executive control, and integrating various streams of information relevant to conscious experience.

Maturation process

The developmental process by which individuals reach physical and psychological maturity, encompassing both natural growth and learned behavior.

Pound for pound

A comparison term used to describe the strength or value of something relative to its weight.

Iron content

The amount of iron, a vital mineral for human health, present in certain substances or objects.