CLASSIFICATION
NINE COMMON ANIMAL PHYLA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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mollusca, arthropoda, cnidaria
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annelida, arthropoda, platyhelminths
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cnidaria, platyhelminths, porifera
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annelida, porifera, chordata
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Detailed explanation-1: -Segmented worms (phylum Annelida) are the most complex animals with worm-like body plans. A study of worms can illuminate a possible history of how some organ systems and body features evolved. Worms are invertebrate animals with bilateral symmetry.
Detailed explanation-2: -The vast majority of animals display bilateral symmetry; also known as plane symmetry, this is a trait that applies to 99% of all animals, in the majority of phyla: Chordata, Annelida, Arthropoda, Platyzoa, Nematoda, and most Mollusca.
Detailed explanation-3: -The Platyhelminthes, or flatworms, are the most primitive bilaterally symmetrical animals. They have a head and a tail, but only one opening into the gut and no body cavity. They are flat because they use diffusion to respire, so all their cells must be close to the surface.
Detailed explanation-4: -Annelids and arthropods are bilaterally symmetrical, that is, the body can be divided into two identical halves only along one imaginary plane.
Detailed explanation-5: -One character inherited by all arthropods is bilateral symmetry.