biological - directional development

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I'm confused about what is being referred to. Are some folks looking at
directional development (in biology) as same as progressionism? I don't
think they're the same. I think that directional development in biological
sciences refers to the generality that more complex physical-physiological-
structures do not give rise to simpler ones (there are exceptions). This
doesn't mean that the simpler ones do not continue to exist or to flourish or
to give rise to other species. And it is true that complex organisms often?
usually? die out (sooner or later) -- viz. the dinosaur example. Simple form
may be evolutionarily viable, complex form, ditto -- and either/or/both not
evolutionarily viable given certain conditions. However, biological model of
changes from simple to complex do not necessarily hold for culture.

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