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Why rubber trees are grown

The rubber tree is grown
because rubber is made from the latex in its bark.

The rubber tree has roots made up of
a tap-root
and creeping roots.

In the bark of the rubber tree
there is a liquid called latex.

The latex is harvested
by making a slit in the bark,
that is, by cutting a piece of bark.

The latex makes the rubber that is used:

Rubber is in great demand all over the world;
more and more of it is needed.

But it is very difficult
to grow rubber trees well
and to harvest the latex.

They cannot be grown everywhere.

They need:

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