Question

1. what type of animal symmetry also includes the formation of a head? what is this process called? those with radial symmetry have an oral side. those with asymmetry display cephalization. those with radial symmetry display cephalization. those with bilateral symmetry display cephalization.

Explanation:

To solve this, we analyze each option:

• Radial symmetry (e.g., cnidarians) has an oral/aboral axis but no distinct head, so options about radial symmetry and cephalization or the first radial symmetry option are incorrect.
• Asymmetric animals (e.g., sponges) don't show cephalization, so the asymmetry option is wrong.
• Bilateral symmetry (e.g., flatworms, arthropods) involves the concentration of sensory and nervous tissues at the anterior end, forming a head—this process is cephalization. So the option "Those with bilateral symmetry display cephalization" is correct.

Answer:

D. Those with bilateral symmetry display cephalization.