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This is my problem: Understand in what taxa these traits first evolved and how they function:...

This is my problem: Understand in what taxa these traits first evolved and how they function: tissues, tissue layers, body symmetry, and body cavities. Understand in what taxa these traits first evolved and how they function: tissues, tissue layers, body symmetry, and body cavities.

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Body symmetry is the physical aspect of science for understanding the divisions of body parts in balanced view. Therefore, it does not need to compare with other characteristics that given in the question. However, if we want to enroll body symmetry according the evolution, then it will come at first position. If we consider the symmetrical shape and asymmetrical shape of body, then we find that from cnideria symmetrical shape starts.

At the 2nd position, body cavities take a place because Porifera at first get body cavity.

In the 3rd position, tissues takes a place because firstly, Cnideria evolved tissues. These also contain tissue layers. Therefore, we also include tissue layers at the same position.

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