1 Pseudocoelomate animals have a pseudocoelom (literally âfalse cavityâ), which is a fully functional body cavity. 2  Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals.n some protostomes, the embryonic blastocoele persists as a body cavity. These protostomes have a fluid filled main body cavity unlined or partially lined with tissue derived from mesoderm.
POLIO is a highly contagious, life-threatening disease with no cure, and while there are vaccinations to prevent it available, ahead of World Polio Day, the World Health Organisation is now advising countries prepare to give out lower doses to make stocks last. 07:50, Mon, Oct 24, 2016 | UPDATED: 09:56, Mon, Oct 24, 2016. GETTY.
Definition. Polio is a contagious viral illness that in its most severe form causes paralysis, difficulty breathing and sometimes death. In the U.S., the last case of naturally occurring polio happened in 1979.olio is a contagious viral illness that in its most severe form causes paralysis, difficulty breathing and sometimes death.