| 1. | In which clade does the blastopore develop into the mouth? |
| | Protostomes | | Deuterostomes | |
| 2. | In which of the protostome clades does molting occur? |
| | Arrow worms | | Ecdysozoans | | Lophotrochozoans | |
| 3. | Protostomes and deuterostomes are triploblastic. Which tissue layer evolved last and is not found in diploblastic animals? |
| | Endoderm | | Mesoderm | | Ectoderm | |
| 1. | In which clade does the blastopore develop into the mouth? |
| | Protostomes | | Deuterostomes | |
1 Deuterostomes develops blastospheres in mouth
2 Ecdysozoans claes involve molting
3 Mesoderm evolved last in diploblastic animals
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