Cells can be considered the smallest LIVING
unit because they are able to grow and multiply,
but there are many things smaller than cells.
Inside cells, there are smaller compartments,
called organelles. Each organelle contains even
smaller molecules, like proteins and DNA. Each
organelle has a specific function. For example,
the nucleus is the organelle that holds DNA,
which is the genetic code that tells the cells
what kind of proteins to make. Each protein
also has a specific function. For example, some
proteins help the cells turn food into energy.
All of the organelles, proteins, DNA and other
molecules work together in one big compartment
(the cell), creating a living unit. Taking it
one step further, different types of cells come
together to form organs like heart, lungs, and
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