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What are the five key evolutionary changes in the animal body plan?
Wiki User
∙ 13y ago
The evolution of symmetry, tissues, a body cavity, patterns of embryonic development, and segmentation (repeated body units).
Symmetry is found as radial symmetry (halves of the body mirror each other) and bilateral symmetry (symmetric in every direction).
Cells differentiate into tissues which allows for specialized structures and functions.
The evolution of body cavities allowed for the evolution of organ systems.
There are 2 patterns of embryonic development in bilateraly symmetrical animals: protostomes and deuterostomes. Other embryonic development classifications are cleavage patterns (spiral and radial), determinate or indeterminate development, and coelom formation.
With segmented animals, each segment has a set of organ systems. This is advantageous because if one segment is damaged, the animal will not die. Segmentation also allows animals to move more effectively since the segments can move fairly independently.
Wiki User
∙ 13y ago
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