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''The main concept of cell theory is that cells are the basic structural unit for all organisms. ... However, in the same way that atoms are the basic unit when you study matter, cells are the basic unit for biology and organisms. In larger organisms, the main purpose of a cell is to organize.''

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volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.