TEXT page 291   Study the tree diagram on page 291.  Then answer the questions.

1. From what common organisms did all of the organisms
shown on the diagram develop?

2. Which organisms are more closely related, sponges and jellyfish or sponges and fungi?  Explain.

3. Which organisms shown in Figure 13.3 don't have backbones?

4. Explain why the tree is a useful model for classifying organisms.