The simplest living creatures are single cell creatures, but in complex life forms, such as human beings, cells also exist in the tissue level. Tissues are groups of similar cells that have a common function. The four basic tissue types are epithelial, muscle, connective, and nervous tissue.
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tissue level
The simplest living creatures are single cell creatures, but in complex life forms, such as human beings, cells also exist in the tissue level. Tissues are groups of similar cells that have a common function. The four basic tissue types are epithelial, muscle, connective, and nervous tissue.