This is not my area of expertise but as far as I understand we refer to a conditioned sound change if a phoneme when in a certain environment becomes another phoneme - there is a certain condition that propells the change. On the other hand we refer to an unconditioned sound change if all phonemes of, for example, two different kinds are merged into one phoneme - there is no condition as it happens in all instances, and ultimately there is a reduction in the number of phonemes as one is substituted for another.
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"Without guests in the building, caretakers are getting creative in how they provide enrichment to animals," the aquarium said in a statement.
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The Shah's refusal to order his troops to fire on protesters forced him to leave Iran on 17 January 1979. ... Facing likely execution should he return to Iran, the Shah died in exile in Egypt, whose president, Anwar Sadat, had granted him asylum.
