One group has more species than all the other groups give, Ask an Expert

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exs of nine Animal Phylum: Porifera, Cnidaria, Nematoda, Arthropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.

jellyfish, snail, earthworm, fly, spong, starfish, snake, flatworm, roundworm

1.Which group(s) lack tissue level organization?
2.Which group(s) of organism(s) begins to show cephalization?
3.Do all organisms on the chart have 3 germ layers (endoderm, ectoderm and mesoderm)? If not which groups lack all three?
4.One group has more species than all the other groups, give the name of the Phylum and exs of species found in this group.
5.Do all fish have the same skeletal structures? If not, describe the differences.
6.Describe the 3 different types of mammals.

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Category:- Biology
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