Biology - Principles
Different structures (organelles)  within the cells have specialised
Stains of different kinds highlight the different chemical compounds that
make up the different components of the cell.
Everything within the cell and the conditions there, (e.g. temperature,
pH,) make up the
Everything outside is the
There is continual movement of materials within the cell and between the
internal and the external environment through pores in the membranes.
Considerable energy and coordination are required to maintain cell
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