Question

3. Which of the following occurred before the Cambrian Explosion?

4. The simplest animals to have body symmetry are?

5. Look at figure 26-1. The cladogram suggests that the Cambrian Explosion most likely took place after the development of which characteristic?

Answer 1

3. Some animals demonstrated signs of segmentation and bilateral symmetry.

4. cnidarians.

5. three germ layers

Answer 2

3 Some animals demonstrated signs of segmentation and bilateral symmetry.
4 cnidarians.
5 three germ layers.