1 Aseptic meningitis is a term referring to the broad category of meningitis that is not caused by bacteria. 2  Approximately 50% of aseptic meningitis is due to viral infections. 3  Other less common causes include. 4  drug reactions or allergies,  inflammatory diseases like lupus.
The cycle will probably take you roughly 6-8 weeks, depending on the amount of dead stuff in the dry rock and the amount of dead life on the live rock that didn't survive shipping and handling by the time it gets back into saltwater. If the rock is really clean, it might be less than six weeks.
4. How long has life existed on Earth? The oldest known fossils are approximately 3.5 billion years old, but some scientists have discovered chemical evidence suggesting that life may have begun even earlier, nearly 4 billion years ago.