What are the two tissue layers found in cnidarians?

What causes illeteracy? Why do I see floating black dots in my eyesight? If some one has mono will they always be contagious? Who created the cure for malaria? How is melanoma diagnosed? Is sidewalk chalk toxic? What is the prefered method of splinting a fractured clavicle? What effect if male ejaculat his sperms and swollowed by female and intered her stomach? Is it possible to get an infection after surgical urinary catheterization? Can you receive an organ transplant if you have a tattoo? How much does a total hip replacement cost an uninsured American? What are the two ways by which air can enter the trachea? What are some trade system regulations and restrictions? What STDs are not viral? What STD is caused by the bacterium treponema pallidum and is often called the great imitator because so many of the signs and symptoms are indistiguishable from those of other diseases? Which condition occurs when the muscle between the esophagus and the stomach is weak or relaxes inapropriately? What is spastic quadriparesis? What are the chances of a person with adrenoleukodystrophy passing the disease to their offspring? What would a reticulocyte count indicate if not within the normal values? Why not use household bleach on concrete what is the effect?