Which of these objects best models the structure of a fat molecule? O A. A key ring with three keys

B. A strand of beads of multiple colors

C. A spiral staircase

D. An interlocked pair of rings

Pls help

Three reasons of the deaths of native americans: new illnesses that their immune systems couldn't cope with. genocides so the settlers could have the good land.starvation from lack of rations and poor infertile land on resevations