Question

Why do monarch butterflies eat milkweed? Plzz ans quickly urgent

Answer 1

Monarchs cannot survive without milkweed;their caterpillars only eat milk weed plants ,and monarch butterflies need milk weeds to lay their eggs

Answer 2

Monarch butterfly cannot survive without milkweed. The caterpillars i.e larvae is the only time where they require a lot of vitamins . So, they feed on milkweed plants and they also need milkweed to lay their eggs. 

Milk weed flowers provide food for adult butterflies.  In flowering times, They provide fuel for  butterfly breeding and migration .