Poly(lactic acid) (pla) has received much recent attention because the lactic acid monomer [ch3ch(oh)cooh] from which it is made can be obtained from carbohydrates rather than petroleum. this makes pla a more "environmentally friendly" polyester. draw the structure of pla.

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

City a and city b had two different temperatures on a particular day. on that day, four times the temperature of city a was 8â° c more than 3 times the temperature of city b. the temperature of city a minus twice the temperature of city b was â’3â° c. what was the temperature of city a and city b on that day? city a was 5â° c, and city b was 4â° c. city a was 3â° c, and city b was â’1â° c. city a was 8â° c, and city b was â’3â° c. city a was 5â° c, and city b was â’5â° c.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.