For plants such as redwood trees, to achieve significant size, they require the evolution of fluid conducting vascular system.
What is a vascular system?
A vascular system is also referred to as circulatory system and it can be defined as an assemblage of conducting tissues and associated supportive vessels that are saddled with the responsibility of transporting oxygen, fluid and nutrients, as well as the removal of metabolic byproducts (wastes) from the body of a living organism such as a plant.
This ultimately implies that, a vascular system is an essential and important living system in all living organisms.
In this context, to achieve significant size in plants such as redwood trees, they would require the evolution of fluid conducting vascular system.
Read more on evolution here: brainly.com/question/524043