How do nutrients get to the cells in a flatworms solid acoelomate body?

In flatworms, which are acoelomates, nutrients are distributed to cells through diffusion. Their flat, thin bodies allow for a high surface area-to-volume ratio, enabling efficient exchange of gases and nutrients directly with the environment. Additionally, a branched gastrovascular cavity helps transport nutrients from the digestive tract to various body cells. Since they lack a circulatory system, this process relies heavily on the proximity of cells to the surface for effective nutrient transfer.