1. What is an animal?

2. Animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers.

3. How do animals differ
from plants?

4. Animals lack cell walls and have
have collagen as their most
abundant protein.
Animals have nerve and muscle cells.
Animals have three distinct cell junc-
tions: tight junctions, desmosomes,
and gap junctions.

5. Early Embryonic Development

6. A Traditional View of Animal Diversity Based on Body-Plan Grades

7. Body
Symmetry
in Animals

8. Body
Plans
of the
Bilateria

9. Protostomes
vs.
Deuterostomes

10. Animal Phylogeny Based on Sequencing of SSU-rRNA

11. Figure 47.6x Sea urchin development, from single cell to larva

12. Cleavage in an echinoderm (sea urchin) embryo

13. Cleavage in a frog embryo

14. Cross section of a frog blastula

15. Gastrulation in a frog embryo