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Some organisms have two kinds of tissues that develop in embryonic life. These tissues are the primary germ layers. If an animal has two germ layers as shown on the left it is said to be diploblastic. |
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Some organisms have three kinds of tissues that develop in embryonic life. If an animal has three germ layers as shown on the right it is said to be triploblastic. Tribloblastic organisms are more advanced than diploblastic organisms. |
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