Germ layers-platyhelminthes
How many germ layers originate body of the platyhelminthes? In relation to this feature how are these animals categorized?
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Platyhelminthes are first triploblastic animals (remember that cnidarians are diploblastic), i.e., they present three germ layers: mesoderm, endoderm and ectoderm.
Name the classes in which mollusc divide? And also write down some representing beings of each class?
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Describe briefly th function of centrioles in cell division
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Write down name of the periods of first meiotic division.
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Are there living beings devoid of cells?
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