How come some flowers are edible and some aren’t ??

Question: How come some flowers are edible and some aren't ??
- Keywords:
  flower,
  food,
  plant
Asked by 787envp29 to William, Roberto, Karen, Jasmine, Chinna on 12 Nov 2018.
- Karen answered on 12 Nov 2018:
  
  Some flowers happen to contain toxic chemicals that can make you sick, sometimes flowers and plants have this so that animals won’t eat them!
- William answered on 12 Nov 2018:
  
  Some flowers have this protection from being eaten by animals with bad tastes and chemicals called toxins which make them not nice to eat 🙂

Question: How come some flowers are edible and some aren't ??