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The four tissue types are Epithelial tissue protects
http://www.chacha.com/question/what-are-and-descri...
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A lot of collagen, elastic fibers, and underlying adipose tissue (fat) - The degradation of these 3 things with age is what inevitably leads to wrinkles and sagging.
http://uk.answers.yahoo.com/question/index?qid=200...
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D. His phenotype is A and his genotype may be AA or AO (IA IA or IAi).
http://answers.yahoo.com/question/index?qid=201111...
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