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an important role in getting and living things, and get rid of waste.

using energy, responding to the If it took a long time for the good
world around you, and stuff to get in or the bad stuff to
reproducing. get out, the cell could not survive.

Many cells have special shapes that A group of cells working together
help them do their job well. For to do the same job is called a

example, one group of cells, called tissue, and a group of tissues
nerve cells, have the job of getting working together to do the same
messages to other cells. Nerve job is called an organ. An
cells have long extensions coming example of a tissue is the stem of
out of them so they can easily a plant. In this tissue, many cells
reach the cells they need to give work together to get water and
the message to. nutrients to the various parts of
the plant. You’ve probably heard
of some organs, like your brain,
heart, and lungs. All of these
organs are made of tissues, and all
those tissues are made of cells.
Cells really are the building blocks
of everything!

The extensions on this nerve cell help it give
messages to other cells

Although cells may have different
shapes, they are all very small. In
fact, you could fit about 500
average-sized cells in the period at
the end of this sentence. Being
small is good for cells, because it
allows materials to get in and out
of the cells very quickly. Cells take

in nutrients, which are substances

that are helpful to people or other

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