The characteristics of connective tissue are cells surrounded by a matrix of fibrous material. In the case of blood, the matrix is not solidified until clotting is induced. The derivation of blood cells from bone marrow highlights its connective tissue origins.
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Well i have no clue just a thought....maybe its because everything in are body is supplied with blood simultaneously all the time.
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Because it transports things like oxygen from one system to another. Also it transports nutrients throughout the body!