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In their new book,
''The Plausibility
of Life,'' Marc
Kirschner and John
Gerhart note that
the eyes of insects
and mammals,
which seem like
singulary complex
structures, actually
share important
biochemical building
blocks.
According to
Kirschner and
Gerhart, we can
now see that the
elephant's trunk, the
elk's antlers, and the
narwhal's tusk —
which appear to be
distinct, complex
innovations — are
really different
expressions of
the same type of
genetic activity,
funneled through
the process of
natural selection.
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