TITLE

Growth

PUB. DATE
January 2009
SOURCE
World Book Science Dataset;1/1/2009, p1
SOURCE TYPE
Encyclopedia
DOC. TYPE
Reference Entry
ABSTRACT
Growth, an increase in size. Nonliving things grow by accretion, or the adding of material to their surface. A crystal, for example, grows by the accretion of chemical substances. The soil grows deeper and richer by the accretion of decaying grass and leaves. Living things, on the other hand, grow by assimilation, or the taking of material into themselves. The material, called food, is used in producing and nourishing cells. As the cells increase in number, the living thing gains in size.
ACCESSION #
37309472

 

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