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

  2. The simplest animals to have body symmetry are?

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

Verified Answer :

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

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

4.  cnidarians.

5.  three germ layers

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