The gradual modification of anatomical structures during the period from conception to maturity is called development.
Development is the gradual changes that occur in an organism, that are non-replaceable and progressive. The changes can be with respect to its size, shape, function, intellect or even genetic in extreme cases.
Anatomical structures are the structures present inside the body of an organism. These include various components like the cells, tissues, organs, the spatial arrangement between them and their coordination. For example, the spinal cord or the muscles or the bones, all these structures are the anatomical structures. And they show gradual changes with time, characterized as development.
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