In International Phonetic Alphabet, [p, t, k] retain their own pronunciation. They are "Voiceless" when you make its sound but has puff of air called aspiration.
The pronunciation of P is like that of B but it is voiceless. Make a sudden exhale and pronounce the 'p' sound with an explosive breath.Try to pronounce 'stop' and 'spot' - spot contains an aspirated version of /p/, with a puff of air after the stop is released; [p^h] - stop contains a plain /p/, without a puff of air after the stop; this is written just [p]
The pronunciation of T is voiceless. Make a sudden exhale and pronounce the 't' sound with an explosive breath.Try tin and stone - stone contains an aspirated version of /t/, with a puff of air after the stop is released; [t^h] - tin contains a plain /t/, without a puff of air after the stop; this is written just [t]
The pronunciation of S is voiceless. Make a sudden exhale and pronounce the 's' sound with an explosive breath.Try skirt and kick - skirt contains an aspirated version of /k/, with a puff of air after the stop is released; [k^h] - kick contains a plain /k/, without a puff of air after the stop; this is written just [k]
The basic needs for the survival of all living organisms are the same. All living organisms need to respire, digest food for obtaining energy, and get rid of metabolic wastes. Cells are capable of performing all the metabolic functions of the body. Hence, cells are called the functional units of life.
