Nomex and kevlar are polyamides that are unusually tough and flame resistant. what structural feature makes nomex and kevlar different from other polyamides

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

What is the 77 element on the periodtic table

What characteristic make legumes a good food source for food insecure populations