Scelta multipla
Which of the following is not a characteristic of animals?
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30. Overview of Animals
Overview of Animals
Scelta multipla
Which phylum of animals are eumetazoans but not bilaterians?
A
Chordata
B
Cnidaria
C
Arthropoda
D
Annelida
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Begin by understanding the term 'eumetazoans'. Eumetazoans are animals with true tissues, which means they have organized groups of cells that perform specific functions.
Next, consider the term 'bilaterians'. Bilaterians are animals that have bilateral symmetry, meaning their body can be divided into mirror-image halves along one plane.
Now, identify which phylum of animals are eumetazoans but do not exhibit bilateral symmetry. This means looking for animals with true tissues but not bilateral symmetry.
Review the characteristics of the phyla listed: Chordata, Arthropoda, Annelida, and Cnidaria. Chordata, Arthropoda, and Annelida are all bilaterians, as they exhibit bilateral symmetry.
Cnidaria, on the other hand, are eumetazoans that exhibit radial symmetry, not bilateral symmetry. Therefore, Cnidaria fits the criteria of being eumetazoans but not bilaterians.
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