The First Animals to Show Cephalization Have Several Characteristics

question 22

Multiple Choice

The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?

• A) These animals were triploblastic.
• B) These animals had a proboscis.
• C) These animals were in phylum Platyhelminthes.
• D) These animals are placed in the group Lophotrochozoa.
• E) These animals followed the protostome pattern of embryonic development.

---

Definitions:

Iliac Crest

The upper, outer curved edge of the ilium, the largest bone of the pelvis, important for muscle attachment and landmark in medical examinations.

Lower Torso

The lower part of the human torso, comprising the abdomen and pelvis.

Serratus Anterior

A muscle that originates on the surface of the upper eight or nine ribs and inserts along the entire anterior length of the medial border of the scapula, playing a crucial role in the movement and stabilization of the shoulder.

Significance Level

The probability of rejecting the null hypothesis in a statistical test when it is actually true; a measure of the threshold of statistical significance.