In article , Malcolm
writes
Hmm, but that's just not true, is it? What about plants that are
dependent upon insects for fertilisation not to mention those which
depend on birds and animals for seed dispersal?

Those plants have developed or evolved that way to make use of animals
etc. which are there now, but were not so previously. That does not
alter the fact that on this planet non-plant life is wholly dependent
upon plant life, but not vice-versa.
--
Alan & Joan Gould - North Lincs.