which phyla lack organs? what type of symmetry do they have?
which phyla lack organs? what type of symmetry do they have? List all of the phyla that show cephalization?
Do all organisms on the table have 3 germ layers (endoderm, ectoderm and mesoderm)? If not, which Phyla have fewer than three germ layers?
One phylum has more species than all the others. State the name of this phylum and provide several different examples of species found in this phylum.
According to chapter 24, fish do not all have the same skeletal structure? Describe the differences among fish from the most primitive to more advanced types.
Describe the three types of mammals based on how their young develop?
porifera and cnideria
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