sentences:  Sir Thomson believed, as did many adherents of the then-recent theory of evolution, that the deep sea would be home to "living fossils" long extinct in shallower waters, examples of "missing links".They believed that the conditions of constant cold temperature, darkness, and lack of currents, waves, or seismic events provided such a stable environment that evolution would slow or stop entirely.Louis Agassiz believed that in the deeps "we should expect to find representatives of earlier geological periods."