Before sin entered the world, there were no net deteriorating effects of
the second law of thermodynamics. The decay that we see today, including
organisms such as fungi, predators, and parasites, is a result of Adam's
sin.
Parasites have advanced derived features, which
are necessary
for them to survive as parasites. The same is true of fungi,
predators, and other supposedly "deteriorated" organisms. Even the
Institute for Creation Research (ICR) recognizes that features such as
thorns, fangs, and poisons evolved after the Fall. The evolution of
features such as thorns and poisons where there were none before is not
a deterioration of the organisms that get them.
The record of life on earth shows advancement, not deterioration. The
earliest records show only bacteria. This was followed in the late
Precambrian by primitive multicellular organisms, then animals with
hard parts, then land animals, and so forth. The largest plants and
animals that ever lived are living today. We know of no other time
when biodiversity was greater than in historic times. A few mass
extinctions have occurred, but these provided fresh starts for new
forms of life to evolve.
The amount of evolution that the ICR attributes to "deterioration"
would certainly be regarded as macroevolution by any rational standard.
The evolution of a death-based ecology after the Fall would be almost
as big a change as the original creation.
