In which phylum do cells performing the same function arrange into tissues for the first time?
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Correct answer: Coelenterata
Coelenterates (Cnidarians) and Ctenophores exhibit the tissue level of organization. In these animals, the arrangement of cells is more complex than in sponges, forming distinct tissues.
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More Basis of Animal Classification questions
- Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called:
- An undifferentiated layer, mesoglea, is present in between the ectoderm and the endoderm in:
- Radial symmetry is observed in which of the following phyla?
- When the body can be divided into identical left and right halves in only one plane, the symmetry is called:
- The body cavity which is lined by mesoderm is called:
- In some animals, the body cavity is not lined by mesoderm; instead, the mesoderm is present as scattered pouches. This is known as: