That is a very interesting question. There
are many many different types of plants on
Earth. They can grow almost anywhere as long as
there is enough water, sunlight and the
temperature isn't too cold. Plants are grouped
by shared features, especially how they appear
when they flower or reproduce. That means that
some trees are more closely related to
dandelions (for example) than they are to other
trees. Some plants are very ancient in their
origin and others only came about very recently
in time. There are thought to be 300,000
different species of plants on Earth. That's
around the number of individual hairs on 3
people's heads! That's a lot of plants!
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