~LTHOUGH we accept as plants are green, their green
axiomatic
the
fact
that
,~ pigment, chlorophyll, is remarkable in the biological world. It makes plants,
~te literally, providers of energy to the world s host of living organisms--man
all the other animals, and even nongreen plants. For it is chlorophyll that
~s plants the unique ability to utilize the energy of sunlight for the manufac-
~0ffood; and this in turn means that fungi and animals can use plant com-
I~ands for energy and for their own building materials, either directly or
~ugh complex food chains. And to man, of course, Plants furnish thousands
:other useful products beyond the primary benefits of food.
..We: know from the fossil record that plants appeared on this earth hundreds
~millions of years ago. Although the actual origin of living matter continues
ibe a controversial question, it is likely that the earliest living "organisms,"
hose composition is unknown, derived the energy for growth and reproduc-
m by simple chemical means. Presumably they broke down chemical com-
~unds in their watery environment; eventually they utilized the sunlight by
.~ns of photoreceptive pigments. However it occurred, from some unknown,
i"imitive green organism the continuous process of evolution has given us all
~e wonderfully diverse and fascinating world of plants we live in today. They
found almost everywhere, and the adaptations they have made to special
~vir0nments, as the cactus family has to deserts, are as extraordinary as any-
~ng in nature.
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