sentences:  Certain functions of organisms are mediated by gravity, such as gravitropism in plant roots and negative gravitropism in plant stems, and without this stimulus growth patterns of organisms onboard spacecraft often diverge from their terrestrial counterparts.Additionally, metabolic energy normally expended in overcoming the force of gravity remains available for other functions.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".