Which figure most likely represents an acoelomate condition?    

Principle: an acoelomate has no body cavity between the body wall and the gut; the space is filled with solid tissue. 1. In an acoelomate transverse section, the region between outer ectoderm and inner endoderm appears solid rather than forming a clear cavity. 2. img-5.jpeg shows this solid middle region, matching the condition in platyhelminthes. 3. img-6.jpeg instead shows scattered mesodermal pouches, which is typical of a pseudocoelomate. 4. img-7.jpeg shows a more continuous mesodermal arrangement around a cavity, fitting a true coelomate pattern. Why the distractors are tempting: img-3.jpeg and img-7.jpeg both show internal spaces, but the presence of a cavity rules out acoelomate organization. img-6.jpeg has incomplete mesodermal lining, but it still represents a pseudocoel, not absence of coelom.