Animals in which the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm, are called:
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Correct answer: Diploblastic
Diploblastic animals, such as coelenterates, possess only two primary germ layers. An undifferentiated layer called mesoglea is present between the ectoderm and the endoderm.
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More Basis of Animal Classification questions
- 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:
- Which of the following phyla is characterized by the absence of a body cavity (acoelomate condition)?