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Cells are the building blocks of all living organisms. Individual
cells are classified as living things, and there are millions of
organisms that are unicellular across the planet.As they are living units, cells consequently need energy, and
therefore respire to survive. Parts of the cell, called organelles, work
like organs of a body. Energy for the cell to process can be provided
by the cell, such as through photosynthesis in plants, or absorbed into
the cell through cell membranes and then processed within it by the
mitochondrion. More...
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