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• BIOLOGY IS A NATURAL SCIENCE CONCERNED WITH THE STUDY OF LIFE AND LIVING ORGANISMS INCLUDING THEIR STRUCTURE FUNCTION GROWTH EVOLUTION DISTRIBUTION IDENTIFICATION AND TAXONOMY
• CELL IS THE BASIC STRUCTURAL AND FUNCTIONAL UNIT OOF LIVING ORGANISMS
• CELL THEORY IS COLLECTION OF IDEAS AND CONCLUSIONS FROM MANY DIFFERENT SCIENTISTS OVER TIME THAT DESCRIBES CELLS AND HOW CELLS OPERATE
• ROBERT HOOKE: DISCOVERED CELL
• LEEUWENHOEK: OBSERVED LIVING CELL
• ROBERT BROWN: DISCOVERED NUCLEUS
• FELIX DUJARDIN: DISCOVERED FLUID CONTENT OF CELL
• MATTHIAS SCHLEIDEN: PROPOSED ALL PLANTS ARE MADE UP CELLS
• J.E PURKINJE: NAMED FLUID CONTENT OF CELL AS PROTOPLASM
• SCHWANN: PROPOSED ALL ANIMALS ARE MADE UP OF CELLS
• BRAUN: PROPOSED CELL IS THE BASIC UNIT OF LIFE
• VIRCHOW: PROPOSED ALL CELLS ARISE FROM PRE EXISTING CELLS
• UNICELLULAR ORGANISM: THAT IS MADE UUP ONLY ONE CELL IS CALLED AS UNICELLULAR ORGANISM
• MULTICELLULAR ORGANISMS: AN ORGANISM THAT IS MADE UP OF MORE THAN ONE CELL IS CALLED AS MULTICELLULAR ORGANISM