sentences:  This may take the form of accelerated growth in organisms as diverse as worms like "C. elegans" to miniature parasitoid wasps such as "Spangia endius".It may also be used in the augmented production of secondary metabolites such as the vinca alkaloids Vincristine and Vinblastine in the rosy periwinkle ("Catharanthus roseus"), whereby space grown specimens often have higher concentrations of these constituents that on earth are present in only trace amounts.From an engineering perspective, facilitating the delivery and exchange of air, food, and water, and the processing of waste products is also challenging.