11.   Ittel says preliminary results are so encouraging that DuPont may start making basic plastics again.

12.   John Shanklin, a biochemist at Brookhaven National Laboratory, is evolving vegetable oils that could be used in place of petroleum in making plastics.

13.   LDPE resins, which are derived from ethylene, are used to make plastics for films and sheeting.

14.   Petrochemicals, such as benzene and styrene, are used to make plastics for both consumer and industrial use.

15.   Plastics are made of an entwined mesh of long molecules called polymers, each with a central strand of carbon atoms.

16.   Plastics are made of long strands of carbon-based molecules known as polymers.

17.   Plastic is made from a resin that emerges from a petrochemical product made largely from oil.

18.   Q. How is plastic made?

19.   The substance is acrylamide, a chemical used in making plastics.

20.   They make plastics.