Earth is divided into five (or sometimes six) kingdoms by
scientists. We have so far concentrated mainly on the greatest
kingdom, that of animals. In the preceding chapters, we considered
the origin of life itself, studying proteins, genetic information,
cell structure and bacteria, issues that are related with
two other kingdoms, Prokaryotae and Protista.
But at this point there is another important matter we need
to concentrate on-the origin of the plant kingdom (Plantae).
We find the same picture in the origin of plants
as we met when examining the origin of animals. Plants possess
exceedingly complex structures, and it is not possible for
these to come about by chance effects and for them to evolve
into one another. The fossil record shows that the different
classes of plants emerged all of a sudden in the world, each
with its own particular characteristics, and with no period
of evolution behind it.