Publisher's Synopsis
Excerpt from Zoology of the Invertebrata: A Text-Book; For Students
Protoplasm is the name given to that colloidal, jelly-like substance which forms the basis of all life on this globe. Every living organism consists of protoplasm and the products of protoplasm. Whilst life lasts it is continually renewed from food which passes into the organism, and which, by the action of the protoplasm already there, is built up into new protoplasm. At the same time other portions of the protoplasmic body of the organism are being broken down, and the products thus formed are either thrown out from the body as excreta, or remain in the body, either stored away as useless, or in most cases performing some useful function, such as that of protecting the organism by forming a cyst or shell or internal skeleton.
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