What is considered the most primitive true animal?
a. Porifera
b. Cnidaria
c. Annelida
d. Mollusca
ANS: A
Sponges, in the phylum Porifera, are the most primitive. They are all suspension feeders that are found
in all latitudes. Information can be found in the section Invertebrates Are the Most Successful and
Abundant Animals
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Fill in the blank with correct word.