CellsandTissuesarefundamentalunitsoflifethatformthebuildingblocksofalllivingorganisms.Cellsarethesmalleststructuralandfunctionalunitsoflife,capableofperformingessentialprocessessuchasgrowth,reproduction,andenergyproduction.Theycontainspecializedstructurescalledorganelles,eachwithspecificfunctionstomaintaincellularactivities.Tissuesaregroupsofsimilarcellsworkingtogethertoperformaspecificfunction.Therearefourprimarytypesoftissuesinanimals:epithelial(coveringandlining),connective(supportandstructure),muscle(movement),andnervous(communicationandcontrol).Inplants,tissuesincludemeristematic(growth)andpermanent(support,transport,andphotosynthesis).Understandingcellsandtissuesiscrucialinbiology,medicine,andbiotechnology,asithelpsexplainhoworganismsdevelop,function,andrespondtodiseases.
