To protect itself from herbivores, plants

a, have thorns

b, secrete toxins

c, cannot do anything because they cannot protect themselves

d, both secrete toxins and have thorns

Yes he thought they should be left to chance why, because he thought that was the best thing to do

What is the question? if you were looking to design a method of separating something, you can separate this compound by putting both in water and allowing the water to dissolve the sugar. then pour it into another beaker and evaporate it then boom! salt and sugar : )