Why can plants without a vascular system grow very tall?

A non-vascular plant is a plant without tubes to carry water and nutrients throughout the plant. Non-Vascular plants are less complex than vascular plants. ... Non-Vascular plants cannot grow very tall and because of their small sizes they can absorb enough water to carry materials throughout the plant.

Pro insulin undergoes extensive posttranslational modification along the production pathway .

What are the options?