BIOL 1002 Chapter : Chapter 23 Animal Diversity I Part 1
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In addition to these characteristics, as animals evolved, they developed _more complex and organized bodies ___ Some of the differences in complexity and organization are: Cephalization is the _concentration of nervous tissue _ (including a brain and sensory organs) into a defined region (head) of the body. Segmentation is a body design in which similar units are present. These and other characteristics are used to define the phyla within the kingdom animalia table 23. 1 (phyla: Porifera, cnidaria, playhelminthes, annelida, mollusca, arthropoda, nematoda, ecinodermata) ___cllular specialization __ can lead to the development of _tissues _, which then can lead to the combination of tissues into an organ. Organs may then become arranged into __organ systems _. _tissues are _specialized with a common structure and function that are grouped together. Organs _ are _centers of bodily function _, which are usually made up of _different tissues _.
