Discuss the levels of body organization in metazoans.

The higher animals are the multicellular metazoa. All metazoa are composed of a large number of cells. In such a creature, there is marvelous unity and division of labour among the various cells which form the body.

Metazoan cells differ in shape and size according to the special nature of the function which they are to perform. Some of the cells carry on respiration, others nutrition and still others repro­duction. Thus, there is a physiological division of labour.

Tissues:

In higher metazoa, cells are aggregated to form tissues. A tissue may be defined as a collection of similar cells adapted to carry out the same general function. Four principal types of tissues are recognised in all ____ ______ ________ ___ ________ ___ ______ __________ _____ __________ __________.
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